I have a similar problem. I've installed 5 replace cars as described in each '' readme ''.
I used OpenIV for that. also installed is: Script hook V + Native Trainer 1.0.1737.0 - / - Community script hook V .NET 2.10.10 - / - Menyoo PC [Single-Player Trainer Mod] V1.1.0 - / - Gameconfig.xml 4.0 -/- OpenIV.ASI -/- OpenCamera
Menyoo does not work for me. It does not open. Unfortunately, I do not see any of the inserted cars. I installed all vehicles in the mod folder. I also checked in OpenIV if the file was really changed. The new models are displayed but they are not in the game then.
I also have no problems with my game. It starts normally and I can play story mode and online.
I hope somebody can help me.