@Hyperkvlt, Let me post an updated video with step by step instructions on how to integrate Backtrace SDK into Unity. I will be posting it shortly.
Edit:
1. Importing Backtrace into Unity: https://ior.ad/8his?iframeHash=watchsteps-1
2. Configuring Backtrace to report errors: https://ior.ad/8hjo?iframeHash=watchsteps-1
3. Steps to create a free Backtrace trial account: View here