Try to check your RENPY plugin, you need install more than one. Check versions and get sure to install the best on Renpy 6.9, Renpy 7 and Renoy 8.
After installing those 3 ( maybe 4) plugins when you run the game the app wil select the most compatible.
I almost every game works for me.
Right, I am not touching this dev milking game until at least 10 updates have happened. Though if history is any indication they will all be pathetic remakes of the tiny bit of story that has been done.