Mount the Windows ISO file or insert the USB drive. Look in the \sources\sxs\ directory.
An alternative method is to place your CAB file inside a folder and point DISM's feature-enabling command to that folder. This is the approach most commonly discussed in troubleshooting forums. Microsoft-windows-netfx3-ondemand-package.cab -Extra
: Windows tried to download the feature but failed. This happens when you forgot /limitaccess and your network is restricted. Mount the Windows ISO file or insert the USB drive
The /LimitAccess switch prevents Windows Update from hijacking the process, forcing DISM to rely strictly on your offline file. Group Policy Blocking (Enterprise Environments) Microsoft-windows-netfx3-ondemand-package.cab -Extra