(If you tell me the specific game or link you saw, I can point to the most likely official release page.)
If you cannot get the official Low Specs Experience Optimization Control Panel download to work, consider these alternatives: Low Specs Experience Optimization Control Panel Download
However, none of these offer the per-game configuration file hacking that LSE provides. (If you tell me the specific game or
Warning: Because this tool makes deep system changes, fake versions exist on ad-ridden websites. Follow these steps exactly to avoid malware. However, none of these offer the per-game configuration