When you say it "stops", is the loading screen stuck at ~75% forever? Or is it closing/crashing?
The loading bar simply stops ~ 75% and disappears, there is also nothing in the task manager, I assume it crashes. It doesn't appear to be "stuck".
Can you download the sdk for renpy 8.1.3 and try to run the vn from that? https://www.renpy.org/latest.html
