Ahh getting crazy, struggling all day with this, reading all 12 pages and trying things but without luck:
I downloaded the 1.49.9 non-steam version and updated with seperate files to 1.50.10.
DX9 and DX11 are working outside RL/HS.
Copied your .ahk and .isd in the Pinball Arcade module folder.
Renamed my PinballArcade11.exe to PinballArcade.exe
Edited the Pinball Arcade Emulator screen as show in your example and added the path to my exe: G:\Emulators\Pinball Arcade\PinballArcade.exe
In RL set to Rom Only and Mute Emulator on Fade to True
Changed all module settings as told (added Enter key as my Enter Key, My Tables empty and All_Tables to True)
Downloaded your XML
When I select a game from RL, Pinball Arcade is starting, the Mute is working, after a while the Mute ends but nothing happens after that. It's not browsing to the right table. It just stays on the 1st Start Screen. Also the Esc is not working when in-game, I'll have to click on Exit Game to exit.
So it looks like the module isn't working at all. However the No-Nag is working when starting from RL.
Last thing I tried was (after reading the module info, was giving RocketLauncher and PinballArcade admin rights....and after that...it worked.....pffffff.....maybe also something for your tutorial.
So maybe djvj and you can update the module to the latest (working) version to 1.50.10 and change the module info to Rom Only (for non-steam users).
PS. is there a video pack for the tables somewhere?