Yeah that's exactly what I was having issues with too :(
I would recommend joining the Flashpoint discord server and maybe ask there: https://discord.gg/qhvAkhWXU5 . Wish I could do more but gl gettin it to work!
Hello! Sorry for the late response, didn't know about this thread until today. I had the same issues you are having but it's been so long I don't remember exactly why I needed to do in order to get the game working. I checked my Flashpoint and one thing I noticed is that I "curated" the game with I'm assuming the same files you downloaded. Then, I remember changing the "App path" to FPSoftware/Shockwave/PJ851/SPR.exe which its shown on my end. That's really all I can fairly remember. Hope it helps!
I think both versions have vehicles, either way I already did a test run for All S.C.A.M.P.E.R.S without vehicles and is not quite as hard as you might think of
No entry for Retrobution yet, but you could easily set it up yourself if you go to https://www.speedrun.com/support/tickets/new and complete a run first
I made this doc with the basic knowledge for this game and some tips for speedrunning it :) For those interested: https://docs.google.com/document/d/19xEFfZmHlD5jlhgHOAjYVCXBU0G3W5M5atWvkFo1rJQ/edit?usp=sharing