Error: Error downloading

Any time I attempt to verify or upload code, I get the error "". I've seen quite a few posts online about this issue, but none have solved my problem. I've tried:
-Accessing in browser (worked)
-Taking down my firewall
-Removing package-index.json
-Removing the /arduino15 folder
-Uninstalling and reinstalling the IDE, including redownloading the installer

Does anyone have anything else to try? Is there a way to run code without accessing this file online?

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