The extreme performance preset drastically lowers the internal render scale. To fix this, open the tool and manually increase the resolution scale slider to 90% or 100%. If you want to fine-tune your configuration, let me know: What specific game are you trying to optimize? What are your PC hardware specs (CPU, GPU, RAM)?
: If a game update or initial installation is interrupted, the core zone files may be missing.
If the game crashes on loading, verify that the mod version matches the current game build. Final Verdict: Is It Worth It?
If the downloaded file is in a .zip or .rar format, extract it. You are looking for a .scs file.