Fix Delphi GetIt Package Manager failing on downloading 10.4 Patch 1 Patch 2 or Patch 3 (or even more recent patches or components).
The Error said “Cannot load tata from the server”

This is caused by installing Delphi through the offline installer. The offline Installer forgets to switch the filesource to online and GetIt tries to download patches from your DVD drive / USB Stick.

To fix it, open a command prompt in your delphi folder: (often D:\Program files (x86)\RadStudio\21.0\bin\   ) and execute this command:
GetItCmd.exe -c=useonline

Or you could use regedit and navigate to this key:
Computer\HKEY_CURRENT_USER\SOFTWARE\Embarcadero\BDS\21.0\CatalogRepository

And set “ServiceKind” to “Online“
ServiceKind = Online

Now close your Delphi IDE and reopen it and try your GetIt which should be working by now.