You’re not alone! I’ve got the similar errors on 4.0.0-rc1 and rc2.
Tried on a two systems (Windows 10, and Vista).
Example error:
IO_ERROR: http GET command failed
Cannot get/download Zip archive: ‘https://codeload.github.com/KiCad/Pentawatts.pretty/zipmaster’
for library path: ‘https://github.com/KiCad/Pentawatts.pretty’.
Reason: ‘Not found’
When I try to follow the https link in my browser I get a gibhub 404 error.
Has something happened to the git? Was it deleted? Will it return?
Sorry for being git illiterate. I’m very new.