Already finished the game - had to change some lines here and there, like 9th mission (milbase again) where "rpk_butt" was missing - had to add new entry in "items" in INI/ITEMS folder
There was crash in 2nd home defence mission, but somehow vanished after reinstalling the game. Seems like it helps to alter enemy loadout (weapons and grenades) to skip the crashes?

Regarding your problem with the game "Marauder/Man of Prey", I found a note about the mod. This can help with some crashes, if there are crashes in menu, then just "check the integrity of the files" in the game settings through the library.
Notes:
- After installing the mod, it is advisable to delete all files from the RenderedItems folder.