This post is written for IT pros, system administrators, and advanced Windows users who encounter errors when trying to install .NET Framework 3.5.
dism /online /add-package with a folder instead of a CAB?No. /add-package requires a .cab or .msu file. Use /enable-feature /source: for folders. Microsoft-windows-netfx3-ondemand-package.cab -Extra
Obtain the CAB file: