First Things First
WTFast requires .NET Framework 4.0 or higher in order to function properly.
Please verify which version of .NET Framework you have installed. To do this:
Open Control Panel.
Click Uninstall a Program.
On the left side of the window click Turn Windows features on or off.
You should see which versions of .NET you have installed in the window that pops up.
If you see .NET Framework 4.0 make sure that it is selected and click OK.
If you do not see it please try downloading and installing .NET Framework 4.0 from this link:https://www.microsoft.com/en-ca/download/details.aspx?id=17718
Once it is installed please restart your computer and try WTFast again.
Still not working?
Press "windows key + r" and type in %localappdata%
Browse down to "AAA_Internet_Publishing,_" and delete it. Reinstall WTFast.
Please follow these link for further troubleshooting guides:
Thanks for using WTFast.