Hi,
I just recently installed 2.0.3 and first time it opens it tries to install all the packages. This for the most part worked except it seems that two libraries failed to install. The more important of the library appears (to me) to be the library that has all the boards in it which means the IDE is completely useless to upload sketches.
The output of the on the IDE is
Downloading packages
arduino:avr-gcc@7.3.0-atmel3.6.1-arduino7
arduino:avrdude@6.3.0-arduino17
Failed to install platform: arduino:avr.
Error: 13 INTERNAL: Server responded with: 503 Service Unavailable
Failed to install library: Arduino_BuiltIn:1.0.0.
Error: 9 FAILED_PRECONDITION: Library 'Arduino_BuiltIn@1.0.0' not found
while two little panes pop up on the console in the bottom right hand corner.
Edit: I have attempted to install 2.0.3 on two separate computers, one is running Windows 10 Enterprise pro, and the other Windows 11 Pro (intel, and amd respectively).