At the time being, "Prison Architect" crashes to desktop as soon as you start the last tutorial ("Bootstraps"). It does unlock its intro cutscene ("Revisit"), and, as launching it from the cutscene menus does also crash the game, I suppose that's where the problem is.

Anyway, some have bypassed this largely reported issue on the steam version by launching a "beta fix" from the Steam client's menu :

https://steamcommunity.com/app/233450/discussions/0/364043054110541428/

I suppose there is no way to do anything similar on the GOG edition ?

I'm having the exact same problem and also found solutions related to Steam. I've yet to find any solution for GoG though.

I'd be interested in a fix if anyone has any ideas!

This must be why I only played some of the tutorial and then dove into the game.