Keep a copy of the sxs folder on your IT USB drive. You never know when a legacy app will come back to haunt you. Have a different error code? Drop a comment below or check our [DISM Error Code Cheat Sheet].
We’ve all been there. You’re setting up a legacy application (maybe an ERP system, a manufacturing tool, or an old game), and you hit that dreaded pop-up: net framework 3.5 offline install
“This application requires .NET Framework 3.5.” Keep a copy of the sxs folder on your IT USB drive
You click “Install,” expecting a quick fix. Instead, Windows starts searching for updates... and fails. Or worse, it sits at 0% for ten minutes before throwing a cryptic 0x800F0906 error. Drop a comment below or check our [DISM
Why does this happen? Because Windows 10 and 11 treat .NET 3.5 as an optional feature that tries to pull files from Windows Update. If your server is air-gapped, your internet is slow, or WSUS isn’t cooperating, you need a better way.
With the DISM method, you can go from error message to "Installation succeeded" in under 60 seconds.