Install .net framework 3.5 in offline mode

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If the PC linked to use WSUS, and cannot connect to Windows Update Server, you will not able to install .net framework 3.5, no matter you use offline installer or go to add/remove program to enable it.

The workaround is use Dism command. However, Dism command required internet connection. In this case, you will need to use Windows 10 ISO file.

1. Mount the Win10 ISO file

2. Run below command (Below example D: is mounted Win10 ISO.)

Dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\sources\sxs /LimitAccess

Done.