Download the .NET Framework 3.5 installer from the Microsoft website or other trusted sources. The installer is approximately 231 MB in size.
Check the box next to .
Corrupted system files often trigger error codes like 0x800F0906 , 0x800F0954 , or 0x800F081F when attempting online installation. Net Framework 3.5 Offline Installer Windows 10 64 Bit
Right-click the Start button > System. Ensure "System type" says . Download the
Type the following command (adjust the path to where your sxs folder or .cab is located): Net Framework 3.5 Offline Installer Windows 10 64 Bit
If you have internet access on a different device, you can pre-download the standalone setup file from Microsoft and transfer it via a flash drive to your offline 64-bit Windows 10 PC.