I've just finished installing IDE 2.3.6 and it hangs on launching. I have searched and seems the common starting point is to post a debug log... So here it is! Thank you in advance!
PS C:\Program Files\Arduino IDE> & ".\Arduino IDE"
PS C:\Program Files\Arduino IDE>
Arduino IDE 2.3.6
Checking for frontend application configuration customizations. Module path: C:\Program Files\Arduino IDE\resources\app\lib\backend\electron-main.js, destination 'package.json': C:\Program Files\Arduino IDE\resources\app\package.json
Setting 'theia.frontend.config.appVersion' application configuration value to: "2.3.6" (type of string)
Setting 'theia.frontend.config.cliVersion' application configuration value to: "1.2.0" (type of string)
Setting 'theia.frontend.config.buildDate' application configuration value to: "2025-04-09T11:26:55.498Z" (type of string)
Frontend application configuration after modifications: {"applicationName":"Arduino IDE","defaultTheme":{"light":"arduino-theme","dark":"arduino-theme-dark"},"defaultIconTheme":"none","electron":{"windowOptions":{},"showWindowEarly":true,"splashScreenOptions":{},"uriScheme":"arduino-ide"},"defaultLocale":"","validatePreferencesSchema":false,"reloadOnReconnect":true,"uriScheme":"theia","preferences":{"window.title":"${rootName}${activeEditorShort}${appName}","files.autoSave":"afterDelay","editor.minimap.enabled":false,"editor.tabSize":2,"editor.scrollBeyondLastLine":false,"editor.quickSuggestions":{"other":false,"comments":false,"strings":false},"editor.maxTokenizationLineLength":500,"editor.bracketPairColorization.enabled":false,"breadcrumbs.enabled":false,"workbench.tree.renderIndentGuides":"none","explorer.compactFolders":false},"appVersion":"2.3.6","cliVersion":"1.2.0","buildDate":"2025-04-09T11:26:55.498Z"}
Starting backend process. PID: 2072
Showing main window early
Using browser-only version of superagent in non-browser environment
Configuration directory URI: 'file:///c%3A/Users/x0110739/.arduinoIDE'
Configuring to accept webviews on '^.+\.webview\..+$' hostname.
2025-08-01T14:42:26.003Z root INFO Backend u.initialize: 19.2 ms [Finished 0.458 s after backend start]
2025-08-01T14:42:26.004Z root INFO Backend Object.initialize: 18.2 ms [Finished 0.458 s after backend start]
2025-08-01T14:42:26.004Z root INFO Backend a.initialize: 1.5 ms [Finished 0.458 s after backend start]
2025-08-01T14:42:26.004Z root INFO Backend a.initialize: 1.3 ms [Finished 0.458 s after backend start]
2025-08-01T14:42:26.004Z root INFO Backend u.initialize: 1.6 ms [Finished 0.459 s after backend start]
2025-08-01T14:42:26.006Z root INFO Backend l.initialize: 19.2 ms [Finished 0.459 s after backend start]
2025-08-01T14:42:26.011Z root INFO configured all backend app contributions
2025-08-01T14:42:26.011Z root INFO Backend l.onStart: 0.8 ms [Finished 0.467 s after backend start]
2025-08-01T14:42:26.012Z root INFO Backend d.onStart: 0.1 ms [Finished 0.467 s after backend start]
2025-08-01T14:42:26.012Z root INFO Backend a.onStart: 0.2 ms [Finished 0.467 s after backend start]
2025-08-01T14:42:26.012Z config INFO >>> Initializing CLI configuration...
2025-08-01T14:42:26.012Z root INFO Backend x.onStart: 0.2 ms [Finished 0.468 s after backend start]
2025-08-01T14:42:26.012Z config INFO Loading CLI configuration from c:\Users\x0110739\.arduinoIDE\arduino-cli.yaml...
2025-08-01T14:42:26.012Z daemon INFO Starting daemon from C:\Program Files\Arduino IDE\resources\app\lib\backend\resources\arduino-cli.exe...
2025-08-01T14:42:26.012Z root INFO Backend w.onStart: 0.2 ms [Finished 0.468 s after backend start]
2025-08-01T14:42:26.012Z discovery-log INFO start
2025-08-01T14:42:26.012Z discovery-log INFO start new deferred
2025-08-01T14:42:26.012Z root INFO Backend v.onStart: 0.1 ms [Finished 0.468 s after backend start]
2025-08-01T14:42:26.012Z root INFO Backend a.onStart: 0.0 ms [Finished 0.468 s after backend start]
2025-08-01T14:42:26.146Z root WARN The local plugin referenced by local-dir:/c%3A/Users/x0110739/.arduinoIDE/plugins does not exist.
2025-08-01T14:42:26.147Z root WARN The local plugin referenced by local-dir:/c%3A/Users/x0110739/.arduinoIDE/deployedPlugins does not exist.
2025-08-01T14:42:26.147Z root WARN The local plugin referenced by local-dir:C:\Users\x0110739\.arduinoIDE\plugins does not exist.
2025-08-01T14:42:26.149Z root INFO Theia app listening on http://127.0.0.1:61609.
2025-08-01T14:42:26.149Z root INFO Finished starting backend application: 136.7 ms [Finished 0.605 s after backend start]
2025-08-01T14:42:26.429Z config INFO Loaded CLI configuration: {"board_manager":{"additional_urls":[]}}
2025-08-01T14:42:26.429Z config INFO Loading fallback CLI configuration to get 'directories.data' and 'directories.user'
2025-08-01T14:42:26.440Z daemon INFO time="2025-08-01T07:42:26-07:00" level=info msg="arduino-cli version 1.2.0"
time="2025-08-01T07:42:26-07:00" level=info msg="Using config file: c:\\Users\\x0110739\\.arduinoIDE\\arduino-cli.yaml"
time="2025-08-01T07:42:26-07:00" level=info msg="Executing `arduino-cli daemon`"
Daemon is now listening on 127.0.0.1:61610
{"IP":"127.0.0.1","Port":"61610"}
2025-08-01T14:42:26.440Z daemon INFO Daemon is running.
2025-08-01T14:42:26.462Z daemon INFO time="2025-08-01T07:42:26-07:00" level=info msg="Starting download" url="https://downloads.arduino.cc/libraries/library_index.tar.bz2"
2025-08-01T14:42:26.497Z root INFO Resolve plugins list: 483.8 ms [Finished 0.953 s after backend start]
2025-08-01T14:42:26.562Z root ERROR Detected an error response during the gRPC core client initialization: code: 3, message: Error downloading index 'https://downloads.arduino.cc/libraries/library_index.tar.bz2': Get "https://downloads.arduino.cc/libraries/library_index.tar.bz2": dial tcp: lookup downloads.arduino.cc: no such host
2025-08-01T14:42:26.562Z root ERROR Detected an error response during the gRPC core client initialization: code: 9, message: Loading index file: loading json index file C:\Users\x0110739\AppData\Local\Arduino15\package_index.json: open C:\Users\x0110739\AppData\Local\Arduino15\package_index.json: The system cannot find the file specified.
2025-08-01T14:42:26.562Z root ERROR Detected an error response during the gRPC core client initialization: code: 9, message: Error loading hardware platform: discovery builtin:serial-discovery not found
2025-08-01T14:42:26.563Z root ERROR Detected an error response during the gRPC core client initialization: code: 9, message: Error loading hardware platform: discovery builtin:mdns-discovery not found
2025-08-01T14:42:26.563Z root ERROR Detected an error response during the gRPC core client initialization: code: 9, message: Loading index file: reading library_index.json: open C:\Users\x0110739\AppData\Local\Arduino15\library_index.json: The system cannot find the file specified.
2025-08-01T14:42:26.563Z daemon INFO time="2025-08-01T07:42:26-07:00" level=info msg="Loading hardware from: C:\\Users\\x0110739\\AppData\\Local\\Arduino15\\packages"
time="2025-08-01T07:42:26-07:00" level=info msg="Loading libraries index file" index="C:\\Users\\x0110739\\AppData\\Local\\Arduino15\\library_index.json"
time="2025-08-01T07:42:26-07:00" level=info msg="Adding libraries dir" dir="C:\\Users\\x0110739\\AppData\\Local\\Arduino15\\libraries" isSingleLibrary=false location=ide
time="2025-08-01T07:42:26-07:00" level=info msg="Adding libraries dir" dir="C:\\Users\\x0110739\\Documents\\Arduino\\libraries" isSingleLibrary=false location=user
2025-08-01T14:42:26.575Z config INFO Loaded fallback CLI configuration: {"directories":{"user":"C:\\Users\\x0110739\\Documents\\Arduino","data":"C:\\Users\\x0110739\\AppData\\Local\\Arduino15"}}
2025-08-01T14:42:26.575Z config INFO Merged CLI configuration with the fallback: {"directories":{"user":"C:\\Users\\x0110739\\Documents\\Arduino","data":"C:\\Users\\x0110739\\AppData\\Local\\Arduino15"},"board_manager":{"additional_urls":[]}}
2025-08-01T14:42:26.575Z config INFO Loaded the CLI configuration.
2025-08-01T14:42:26.576Z config INFO Mapped the CLI configuration: {"dataDirUri":"file:///c%3A/Users/x0110739/AppData/Local/Arduino15","sketchDirUri":"file:///c%3A/Users/x0110739/Documents/Arduino","additionalUrls":[],"network":"none","locale":"en"}
2025-08-01T14:42:26.576Z config INFO Validating the CLI configuration...
2025-08-01T14:42:26.580Z config INFO The CLI config is valid.
2025-08-01T14:42:26.580Z config INFO <<< Initialized the CLI configuration.
2025-08-01T14:42:26.580Z root ERROR The primary packages indexes are missing. Running indexes update before initializing the core gRPC client The index of the cores and libraries must be updated before initializing the core gRPC client.
The following problems were detected during the gRPC client initialization:
[platform-index] - code: 9, message: Loading index file: loading json index file C:\Users\x0110739\AppData\Local\Arduino15\package_index.json: open C:\Users\x0110739\AppData\Local\Arduino15\package_index.json: The system cannot find the file specified.
[platform-index] - code: 9, message: Error loading hardware platform: discovery builtin:serial-discovery not found
[platform-index] - code: 9, message: Error loading hardware platform: discovery builtin:mdns-discovery not found
[library-index] - code: 9, message: Loading index file: reading library_index.json: open C:\Users\x0110739\AppData\Local\Arduino15\library_index.json: The system cannot find the file specified.
2025-08-01T14:42:26.583Z daemon INFO time="2025-08-01T07:42:26-07:00" level=info msg="Updating index" url="https://downloads.arduino.cc/packages/package_index.tar.bz2"
2025-08-01T14:42:26.587Z daemon INFO time="2025-08-01T07:42:26-07:00" level=info msg="Starting download" url="https://downloads.arduino.cc/libraries/library_index.tar.bz2"
time="2025-08-01T07:42:26-07:00" level=info msg="Starting download" url="https://downloads.arduino.cc/packages/package_index.tar.bz2"
2025-08-01T14:42:26.587Z root INFO core-client-provider [library-index] Downloading index: library_index.tar.bz2
2025-08-01T14:42:26.588Z root INFO core-client-provider [platform-index] Downloading index: package_index.tar.bz2
2025-08-01T14:42:26.607Z root ERROR Failed to update platform, library indexes. Error: 13 INTERNAL: Some indexes could not be updated.
at t.callErrorFromStatus (C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:3089094)
at Object.onReceiveStatus (C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:6681994)
at Object.onReceiveStatus (C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:2571739)
at C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:4307911
at process.processTicksAndRejections (node:internal/process/task_queues:77:11)
for call at
at s.makeServerStreamRequest (C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:6681761)
at s.updateIndex (C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:3088187)
at C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:6284829
at C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:6285177
at new Promise (<anonymous>)
at y.doUpdateIndex (C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:6285156)
at y.updatePlatformIndex (C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:6284801)
at y.updateIndex (C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:6284169)
at y.initInstanceWithFallback (C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:6282462)
at async y.create (C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:6282074)
2025-08-01T14:42:26.611Z daemon INFO time="2025-08-01T07:42:26-07:00" level=info msg="Starting download" url="https://downloads.arduino.cc/libraries/library_index.tar.bz2"
2025-08-01T14:42:26.618Z root ERROR Detected an error response during the gRPC core client initialization: code: 3, message: Error downloading index 'https://downloads.arduino.cc/libraries/library_index.tar.bz2': Get "https://downloads.arduino.cc/libraries/library_index.tar.bz2": dial tcp: lookup downloads.arduino.cc: no such host
2025-08-01T14:42:26.618Z root ERROR Detected an error response during the gRPC core client initialization: code: 9, message: Loading index file: loading json index file C:\Users\x0110739\AppData\Local\Arduino15\package_index.json: open C:\Users\x0110739\AppData\Local\Arduino15\package_index.json: The system cannot find the file specified.
2025-08-01T14:42:26.618Z daemon INFO time="2025-08-01T07:42:26-07:00" level=info msg="Loading hardware from: C:\\Users\\x0110739\\AppData\\Local\\Arduino15\\packages"
time="2025-08-01T07:42:26-07:00" level=info msg="Loading libraries index file" index="C:\\Users\\x0110739\\AppData\\Local\\Arduino15\\library_index.json"
time="2025-08-01T07:42:26-07:00" level=info msg="Adding libraries dir" dir="C:\\Users\\x0110739\\AppData\\Local\\Arduino15\\libraries" isSingleLibrary=false location=ide
time="2025-08-01T07:42:26-07:00" level=info msg="Adding libraries dir" dir="C:\\Users\\x0110739\\Documents\\Arduino\\libraries" isSingleLibrary=false location=user
2025-08-01T14:42:26.619Z root ERROR Detected an error response during the gRPC core client initialization: code: 9, message: Error loading hardware platform: discovery builtin:serial-discovery not found
2025-08-01T14:42:26.619Z root ERROR Detected an error response during the gRPC core client initialization: code: 9, message: Error loading hardware platform: discovery builtin:mdns-discovery not found
2025-08-01T14:42:26.619Z root ERROR Detected an error response during the gRPC core client initialization: code: 9, message: Loading index file: reading library_index.json: open C:\Users\x0110739\AppData\Local\Arduino15\library_index.json: The system cannot find the file specified.
2025-08-01T14:42:26.619Z root ERROR Uncaught Exception: Error: The index of the cores and libraries must be updated before initializing the core gRPC client.
The following problems were detected during the gRPC client initialization:
[platform-index] - code: 9, message: Loading index file: loading json index file C:\Users\x0110739\AppData\Local\Arduino15\package_index.json: open C:\Users\x0110739\AppData\Local\Arduino15\package_index.json: The system cannot find the file specified.
[platform-index] - code: 9, message: Error loading hardware platform: discovery builtin:serial-discovery not found
[platform-index] - code: 9, message: Error loading hardware platform: discovery builtin:mdns-discovery not found
[library-index] - code: 9, message: Loading index file: reading library_index.json: open C:\Users\x0110739\AppData\Local\Arduino15\library_index.json: The system cannot find the file specified.
2025-08-01T14:42:26.619Z root ERROR Error: The index of the cores and libraries must be updated before initializing the core gRPC client.
The following problems were detected during the gRPC client initialization:
[platform-index] - code: 9, message: Loading index file: loading json index file C:\Users\x0110739\AppData\Local\Arduino15\package_index.json: open C:\Users\x0110739\AppData\Local\Arduino15\package_index.json: The system cannot find the file specified.
[platform-index] - code: 9, message: Error loading hardware platform: discovery builtin:serial-discovery not found
[platform-index] - code: 9, message: Error loading hardware platform: discovery builtin:mdns-discovery not found
[library-index] - code: 9, message: Loading index file: reading library_index.json: open C:\Users\x0110739\AppData\Local\Arduino15\library_index.json: The system cannot find the file specified.
at C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:6283973
at y.evaluateErrorStatus (C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:6283989)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async a.<anonymous> (C:\Program Files\Arduino IDE\resources\app\lib\backend\main.js:2:6283659)
2025-08-01T14:42:26.837Z root INFO Deploy plugins list: 824.4 ms [Finished 1.293 s after backend start]
2025-08-01T14:42:27.893Z root INFO creating connection for 1
2025-08-01T14:42:28.708Z root WARN Frontend a.configure took longer than the expected maximum 100 milliseconds: 324.7 ms [Finished 2.054 s after frontend start]
2025-08-01T14:42:28.727Z root WARN A command editor.action.toggleStickyScroll is already registered.
Opening channel for service path '/services/electron-window'.
Opening channel for service path '/services/ide-updater'.
2025-08-01T14:42:29.082Z root INFO Start frontend contributions: 447.1 ms [Finished 2.134 s after frontend start]
2025-08-01T14:42:29.082Z root INFO Changed application state from 'init' to 'started_contributions'.
2025-08-01T14:42:29.082Z root INFO Changed application state from 'started_contributions' to 'attached_shell'.
2025-08-01T14:42:29.082Z root INFO >>> Restoring the layout state...
2025-08-01T14:42:29.089Z root INFO [f237ea0d-6cdc-4b1f-892c-c2bbf77f55c0] Waiting for backend deployment: 298.2 ms [Finished 2.429 s after frontend start]
2025-08-01T14:42:29.502Z root INFO [hosted-plugin: 19660] PLUGIN_HOST(19660) starting instance
[Object: null prototype] {}
2025-08-01T14:42:29.962Z root INFO [f237ea0d-6cdc-4b1f-892c-c2bbf77f55c0] Sync of 23 plugins: 878.1 ms [Finished 3.308 s after frontend start]
Closing channel on service path '/services/electron-window'.
Closing channel on service path '/services/ide-updater'.
Stored workspaces roots:
No sketches were scheduled for deletion.