When I get home, I'll copypaste the hex values that were changed and upload the exes that i haven't been able to change. You're probably right, it may just be a license bypass.
Am I allowed to paste the upload links openly on the forum? Would you like me to upload the ones I changed aswell so you can do a comparison or anything?
EDIT: Hex Values I used for TRUnderworld (tr8.exe)
0096F046: 21 → 46
0096F047: 01 → 0F
0096FF90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 → B8 CC B0 25 01 80 38 BE 75 07 80 30 20 C6 40 7F
0096FFA0: 00 00 00 00 00 00 → EB E9 C5 F1 FF FF
Source:
Link (mostly Japanese)
Surely it can be done on the others, all 3 games use the same base engine..well I hope it's as simple as that aha!