Install .NET 3.5 on Server 2012 R2
As this is a very common ‘issue’ I am just going to post the quick-fix:
If you have internet:
DISM /online /enable-feature /featurename:netfx3 /all
Install from install media:
# Where 'd' is the drive the install media is mounted to. You might have # to change it if your media is on a different drive letter DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:d:\sources\sxs