Hi,

installing .NET 3.5 on Windows 8.1 differs from install other feature because you have to specify the location of the files to being installed.

To install .NET 3.5 you need access to a Windows 8.1 DVD especially the \sources\sxs folder.

Let us assumed your CD drive letter is D: then you have to call:
Continue reading Windows 8.1: Installing .NET 3.5 Framework →