If DotNet 3.5 won’t install or fails to install on Server 2012 (Under Features), there is a work around.
You may see this when installing –
Cancel the installation
Insert your Windows DVD and open PowerShell –
- Type the following command and replace ‘d’ with your drive letter of your DVD/CD
- DISM /Online /Disable-Feature /FeatureName:NetFx3 /Source:d:\sources\sxs
- Type the following command in PowerShell
- DISM /Online /Enable-Feature /FeatureName:NetFx3 /Source:d:\sources\sxs
DotNet should now be installed properly.