Unity 5.4.2f2 Project Target Framework issues with Visual Studio on Windows 10

So i have the exact same issue detailed in this question http://answers.unity3d.com/questions/1132048/unity-531-and-visual-studio-2015-project-target-fr.html However the installer that the answer links to doesn't seem to work or do anything. I double click on it and literally nothing happens. I tried googling issues about that too but to no avail. Uninstalled and reinstalled Visual Studio as well but I still get that error dialog box every time Unity changes something about the solution. It's highly aggravating, hoping someone will be able to resolve this issue for me. I have even downloaded the standalone installed for .net 3.5 and enabled it from the Control Panel but things are still messed up.