You can download the specific standalone installer from the Microsoft Download Center . Legacy Windows Versions
While Windows usually downloads these files via Windows Update, an offline installation is necessary for environments with limited internet, air-gapped systems, or when standard updates fail with errors like 0x800F081F. Method 1: Using DISM with Installation Media (Recommended) net framework 3.5 offline
For detailed documentation, you can visit Microsoft Learn to see more on .NET 3.5 deployment. If you need a more localized version of the guide, Microsoft Learn Russia provides similar instructions. For Newer Windows 11 (26H1 and later) You can download the specific standalone installer from
This usually indicates that the system could not install the feature because the system reserved partition is full or there is a corrupted Windows Update cache. Running sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth (if you have internet) can fix underlying system corruption. If you need a more localized version of
If you are trying to run legacy software on a modern version of Windows—whether it’s Windows 10, Windows 11, or Windows Server—you have likely encountered the dreaded "feature require .NET Framework 3.5" error.