When i try to launch it crashes automatically and has the unity crash i really can't find anyone with a similar problem any help?

Should i play my first game in coop (which i prefer) or would i miss something?

I haven't heard anything from the dev team since last feburary

There's a room with an apple you can clone and a fan blocking the way to the button, I tried for so long on the room until I found the fire alarm near the exit door, and I just kept cloning the switch until one of them landed on the button. It didn't feel like a proper solution, what was I supposed to do?...

So there is a feature where you can import models into your game but i'm having trouble finding a way to make one myself. So it'd be nice for application and program suggestions for modeling my own stuff. I'd also like to keep it free so it can't be something like blender even if it is cheap....