It took me awhile to sort through this thread to figure out exactly how to get this to work, so I figured I would make a short step by step to help everyone else figure it out! Enjoy!
1 - Alright well you must download the Toshiba Bluetooth Stack 8.0 (to sync your WiiU Pro Controller) from
http://aps2.toshiba-tro.de/bluetooth/index.php?page=download-toshiba Then once installed, sync the Wii U Pro like a normal bluetooth device using the new BT app (no pin #) and let the buttons continue to flash on the controller.
2 - Follow the steps from
http://gbatemp.net/threads/wii-u-pro-controller-to-pc-program-release.343159/page-13#post-4654493 to break the 30 day restrictions of the bluetooth program.
3 - Download the 4 DLL files from
http://www.mediafire.com/download/2xe936ozwus2u80/ProController_v0.1b.rar and place them in each of the game's folder that has the .EXE in it that you would like to use the Wii U Pro. (The game MUST fully supports an X-Box 360 Controller to work.)
4 - Once theses files are placed in there. Launch the game like normal (works for Steam games as well), A little dialogue box will pop saying its not fully 100% guarantee to work, hit okay and the game will start, the controller will flash and will permanently turn on (player 1 light on controller stays on). And done!
But please note, because its pretending to be a 360 controller, the buttons on Wii U Pro Controller are mapped to the same letter buttons on the 360 controller. So A (WiiU) is actually A (Xbox). If you know anything about theses 2 controller, they are actually in the wrong spot. ALOT of games I tried it with wont allow you to remap the controllers buttons so it takes time to readjust your muscle memory but works wonderfully once you get it down pat.
Hopefully that helps!