same exact issue. was fine until today actually, now none of the saves load as the game always crashes

Had the same issue too. Tried an earlier save, then an earlier one before that, and so on. I eventually found an earlier save that loaded OK. I then played through to the end without issue (though I might not have had to reload at all to make it to the end that time. Seems like at some point mid to late in the campaign, the save file gets corrupted or something and triggers the whole HLA game to crash when you try to load that save - or any save made after it (full crash back to Steam VR) (GREAT mod though!)