If you are using Windows Developer Preview and trying to install any of DotNet enabled application, it doesn’t gives to install since DotNet Framework 3.5 is not being installed in your system. It required Internet Connection to download DotNet Framework Online.
But even if you haven’t internet connection, you can install it from the DVD of Windows Developer Preview.
Place your DVD or USB drive in the computer
Open Command Prompt as Administrator
Run the below mentioned command:
dism.exe /online /enable-feature /featurename:NetFX3 /Source:Z:\sources\sxs where “Z” is the DVD drive or USB
Its very easy process. Just try it.