It fired up once, allowed me to create a new Sim (still no mods, just the packs I've purchased), before beginning to crash again, earlier and earlier in the boot process until it was once again crashing before getting to the main menu.
The culprit is still that python file and it appears the SimulationFullBuild0.package is only 24MB when it should be more than a GB. No amount of fully removing the game, the app, and every single trace of it from my computer before attempting to reinstall has worked in A) making that file the correct size or B) making the game launch successfully.
I have fully exhausted everything. Help. Please. I just want to play the game. x_x