I cant install or update any packages in the package manager

when i choose a package and click on install i get:

- Max 8.1.11 (updated, because it didnt work with an older version either)

system:
- Windows 10 Home with latest update
- tried with Firewalls deactivated
- Max 8.1.11 (updated, because it didnt work with an older version either)

Hello,
I cant install or update any packages in the package manager
when i choose a package and click on install i get:
Error while attempti

Error while attempting to install package