Installing .Net Framework 3.5 with a Windows ISO

Step 1

Download and mount the Windows ISO and take note of the drive letter. Use the path (d:\sources\sxs) replacing D: with the drive letter the ISO was mounted to. Alternatively, you should be able to extract just the sxs folder to a tempory location like (c:\temp\sxs) and install from there. Just remember to take note of the exact path/directory you are placing the files in.

Method 1 - PowerShell

# You can use one of the below 2 commands depending on what is available to the system

Install-WindowsFeature Net-Framework-Core -source d:\sources\sxs
#Or
Enable-WindowsOptionalFeature -FeatureName "NetFx3" -Source d:\sources\sxs

Method 2 - CMD

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:d:\sources\sxs