Godot is being worked on right now. Been trying to create a solution to having true instanced materials in Godot.
Hey, sorry for the late reply. You should be able to rebuild and it should work just fine. Otherwise you could install the previous engine version (it was made in 5.6) and migrate from there. Will update the project to 5.7 soon!
Just enabled Stripe payments, so should be able to pay with a card now :)