You seem to have a file corruption. It might help to download the IDE again and install it; I'm not sure if you have to clean up first. Alternative can be the solution Could not install Arduino AVR platform: Error: 2 UNKNOWN - #7 by Benjamin269
You seem to have a file corruption. It might help to download the IDE again and install it; I'm not sure if you have to clean up first. Alternative can be the solution Could not install Arduino AVR platform: Error: 2 UNKNOWN - #7 by Benjamin269