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I managed to update the library but getting error "Error Downloading http://downloads.arduino.cc/packages/packages_index.json" when updating the Board Manager. I switched the proxy to no proxy instead of automatic. Anyone can help me?

  • use your computer web browser to see if the URL is valid – jsotola Apr 8 '19 at 1:00
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The URL is wrong, and should read:

https://downloads.arduino.cc/packages/package_index.json

Note that "package_index" is in the singular, not the plural.

Check what you have in the "Additional Boards Manager URLs:" section of Preferences.

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