DOT NET 3.5 for Windows 10 Technical Preview
DOT NET 3.5 was often hard to install on Windows 8, 8.1, 2012, and 2012 R2. I tested installing it on Windows 10 Technical Preview for Enterprise:
In Control Panel\Programs\Programs and Features, click turn Windows features on or off, and check the “.NET Framework 3.5” box and click OK
Click “Download files from Windows Update”
It just works!
Same can be done via the DISM command line utility:
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All
Again it works just fine!