ProBuilder Models Disappearing

I have a problem with ProBuilder.

I bought a game from someone, and they sent over the rar file containing the Unity project. When loading it in Unity, everything seemed fine. I recently figured out that the maps were made in ProBuilder, but ProBuilder didnt come with the project that was sent. (The creator says she doesnt know why ProBuilder isnt there) When I install ProBuilder, everything that was built specifically with ProBuilder just disappears. The creator of the game has said that this problem has happened with other people who payed to use the games assets, and she doesnt know why its happening or what the cause of it is.

I payed $100 for this game, so its really important that i get this fixed. Can someone help me out?

ProBuilder is distributed with the package manager.

https://docs.unity3d.com/Manual/Packages.html

My inner “you’ve been scammed” senses are tingling. Is there a public website for the creator of the game?

I dont think ive been scammed. Everything else works just fine. Im friends with the creator and idk why she would do that. And no there isnt a website

Were you just provided a .unitypackage? Or was it the entire project? Because the .unitypackage won’t have the package manifest which is what tells the editor to download ProBuilder. That’s the only other explanation I can come up with because assets don’t just disappear from a project.

I think i got the whole project. There is an obfuscator in the project but i dont know if that has anything to do with it.