you need windows 10 installation media
eg, the iso mounted on drive f:
Dism /online /enable-feature /featurename:NetFx3 /All /Source:f:\sources\sxs /LimitAccess” and press Enter on your keyboard. (Note that you need to replace the <DRIVE> here with the drive letter for the installation media drive or the ISO drive.)
for online
DISM /Image:C:\test\offline /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs
