SOLVED: Cannot Install .NET 3.5 On Windows 8.1 Error 0x800F0906 and 0x800F081F

UPDATE: Dec 2016 – While the process below works very well, you can eliminate future .NET install problems by installing FEATURES ON DEMAND on your companies WSUS server. If you are unable to install .NET 3.5 on Windows 8 or 8.1 and end up with errors like 0x800F0906 and 0x800F081F you will find that errors relate to corrupt or limited access to the source files.  In ALL of the times I have tried to get…