Did you make check the migration guide for the Unity Extension to make sure that all the steps are taken for a successful upgrade:
Thx and greetings
I have been experiencing some issues with Unity crashing everytime that I am using Object Tracking. I wanted to try the updated Wikitude 8.3 but my scene is so big that I wanted to know if there is a way to update Wikitude SDK in the same project. I have tried importing Wikitude 8.3 in the same project, some files were replaced, I then managed to correct them but then the Image tracker in my project won't even initialize. Can you tell me what is the best way to update it without restarting my Unity project from scratch?