If you see the 0x800F0922 .NET Framework installation error while updating or installing .NET Framework 3.5 or 4,8, use these working fixes.

Additionally, if you don't want to download the whole Redistributable package from Microsoft (thus skipping steps 1-3), download only the CAB file for .NET Compact Framework 3.5 from MoDaCo.

Download .NET Framework 3.5 from the official website of Microsoft or Perform an In-place Upgrade. How do I get rid of Windows Update error?