Installing .NET Framework 3.5 in Windows 8.1 or in Windows Server 2012

Mount the Windows 2012 R2 or Windows 8.1 ISO image / installation media:

At an elevated command prompt, run the following command:

Dism /online /enable-feature /featurename:NetFx3 /All /Source:<drive>:\sources\sxs /LimitAccess

Note In this command, <drive> is a placeholder for the drive letter for the DVD drive or for the Windows 8 installation media. For example, you run the following command: