Install .Net 3.5 on Server 2012 without internet connection
dism.exe /online /enable-feature /featurename:NetFX3 /all /Source:D:\sources\sxs /LimitAccess
D:\ in this case is the path to the Windows Server 2012 installation media.
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dism.exe /online /enable-feature /featurename:NetFX3 /all /Source:D:\sources\sxs /LimitAccess
D:\ in this case is the path to the Windows Server 2012 installation media.