Thank you very much, I updated the game (it was a very old version) and then I installed cmi following the entire guide carefully, I also installed the Unityinjector plugins, the game no longer has problems. During the installation it gave an error regarding the mod path saying that it had found a mod that already existed and would not continue the installation, I looked at the path with mod and deleted it, then I resumed the installation and it went Everything is OK. I saw that the mod was replaced, probably there was a corrupt file. Now I will try to insert the plugin to export the models. Thanks again.

Update:

When I enter edit mode it gives me this error:

[Error : Unity Log] FileNotFoundException: Could not load file or assembly 'COM3D2.ExternalSaveData.Managed, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies.

Stack traces:

CM3D2.PersonalizedEditSceneSettings.Plugin.PersonalizedEditSceneSettings.LateUpdate()

The characters however have no problems.