: There is a known bug with newer NVIDIA RTX cards (and some GTX 10-series cards) that causes crashes when certain mods are enabled. Disabling specific high-demand shaders or "Alternate EXE" settings in the mod manager may help. Outdated Game Version
So, you found a working link. You downloaded SuperSonic_Redux.cpk . You dragged it into steamapps/common/Sonic Generations/disk/content . You booted up.
Find the button. Even if it says it's installed, click Uninstall and then Install again to refresh the link. 2. Verify Game File Integrity
Sonic Generations mods fail to work, it is often due to an outdated mod loader, incorrect installation paths, or configuration file conflicts. Core Troubleshooting Steps