Ah, I just read in that post:
We have released the 4.12.5 Hotfix today. Part of this Hotfix is the inclusion of our fix to allow the Engine to work with Visual Studio 2015 Update 3. If you have Update 3 installed, you can update UE4 to 4.12.5 and should no longer have any problems when compiling code. If you do, please let us know with a new post here…
Unfortunately this Hotfix does not affect previous versions of the Engine, so if you are still using 4.10 or 4.11, you will need to either merge the fix for Update 3 into a source code version of the Engine and build it, or stay on Visual Studio 2015 Update 2.
Well, if you want to stay on an old UE4 version, you better stay on an old release of visual studio aswell?