I am running 1.8.13 on Windows 10 (1909) and cannot install libraries with the Library Manager in the IDE.
When I try to add a library using the Library Manager, it updates the list, allows me to search and click "Install" and begins the progress bar showing the download. The progress bar never moves, the Cancel button makes a Close button appear but then neither do anything. I have to "end task" on the process (which shows up as Java Platform SE binary).
Running the _debug exe shows this as the last line:
2020-06-26T20:58:50.947Z INFO c.a.u.n.HttpConnectionManager:153 [LibraryManager Installer Thread] Connect to http://downloads.arduino.cc/libraries/github.com/FastLED/FastLED-3.3.3.zip, method=GET, request id=DE057DBE70924B63
I get no errors anywhere I know to look.
Things I have tried:
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copy and paste the library URL into Firefox and the library zip file downloads immediately
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try a different library - same behavior
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reinstall Arduino IDE
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install as Administrator
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delete AppData folder
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Remove Arduino folder from Documents
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tried on two systems: Lenovo laptop and Surface Go
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tried a Mac on the same network - it works
Searching found very little. I see the currently sticky issue on the github repo about the IDE UI not starting, and I've never had it not start.
Finally, this worked last week. I did not change the software, but may have done a Microsoft update (I don't remember; there are so many).
What else can I do to identify the problem?
Thank you