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.NET FX 3.5 on Server 2012/2012 R2 (and Win8/8.1)
This is my site Written by Grant on October 3, 2015 – 12:38 pm

I had issues today with a newly loaded ML350 Gen9 server running Server 2012 R2 – pretty  much nothing loaded besides all the Windows updates – first app I went to load required .NET FX 3.5, so I began to add it using the Server manager Add/Remove Roles/Features – I specified the “alternative source” (DVD path E:\sources\sxs\ ) as you need to and it failed

I tried using the manual DISM command to install FX 3.5:

dism.exe /online /enable-feature /featurename:NetFX3 /Source:d:\sources\sxs /LimitAccess

and

dism.exe /online /enable-feature /featurename:NetFX3ServerFeatures /Source:d:\sources\sxs /LimitAccess

It died at 63% as well .

It appears that there are two recent Windows Updates that cause this behaviour and you need to UNINSTALL them to get .NET FX 3.5 to setup on 2012 / Win 8

The article below contains some FIXIT scripts to solve this:

Update for the .NET Framework 3.5 on Windows 8, Windows 8.1, Windows Server 2012, and Windows Server 2012 R2 –
LINK (http://support2.microsoft.com/kb/3005628/en-us)

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