Can’t install .net 3.5 on Windows 8 or 2012

Friday, October 31st, 2014

As Microsoft tries to make things easier; they sometimes cause problems with internal security policies. Like many companies, Windows Update has a few controls on it.

A few Windows 8 installations ran into a problem when they needed .Net 3.5. The update policies blocked the download of needed files for the Windows Features wizard to install it.

Luckily; there is a support note; that explains another method to install.

All that is needed is the DVD or an ISO of the operating system. I used an ISO. A nice new feature is the ability for a virtual drive. Simply copy the ISO, double-click it and and you have the ISO mounted.

After that start an admin level CMD and use the DISM command to install .Net 3.5.

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:<Virtual drive letter>:\sources\sxs

It will run for a couple minutes and it didn’t require a reboot.

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