Saw that the pull request had been merged so I started from scratch as per Install:Windows wiki page.
LateralGM wouldn't compile compileEGMf.dll until I put the specific directory for Java in the settings.ini. %PATH% inclusion is fine, it's literally what the Java installer put for it. Not sure why this still doesn't work for the launcher.
I use the included batch file and type update, it didn't update LateralGM, so I manually downloaded that and put it in. Some other error popped up on attempt to make a blank room run.
Put in enigma.jar from Install:Extra_Packages, got as far as making a blank room. I load up the GM:Pro version of Warbird and I get this very fucking descriptive error:
The debug option didn't help, neither did changing sound or video systems.
Give me a buzz when the barrier for entry isn't so high I have to gdb backtrace anything that isn't a blank room.