I have the same issue, and happen too in The Realm of the Mad God Exalt. The weird part is that I update Unity just now, to the newer version (2020.1.3f1), but when I open the game it says the same "Unity 2019.3.15f1_59ff3e0356d" in a box with the game logo and then it closes, and nothing more happen.
I've been struggling with this error for months, first with Mad God Exalt, and now with Among Us, and I really want to enjoy this game in PC, cause I've played it on phone and it's so good, but I can't find a fix for this issue. Please help ;-;