If you experience a "Critical Error" crash during loading, corrupted temporary files are often the culprit.
Before diving into complex fixes, ensure these basics are covered: Fix League of Legends All Error | Crashing, Fre...
: Open the Riot Client , click your profile icon, go to Settings , select League of Legends, and click Repair . This checks for and fixes missing or corrupted game files. 3. Improving FPS & Reducing Lag If you experience a "Critical Error" crash during
: Sometimes a simple restart clears temporary memory conflicts. : Navigate to your LoL installation folder (usually
: In the same Compatibility tab, check the box for "Disable full-screen optimizations" to prevent Windows overlays from causing freezes.
: Navigate to your LoL installation folder (usually C:\Riot Games\League of Legends ). Locate and delete the Config and Data folders. The game will automatically reinstall fresh versions of these files when you relaunch.
Check out this quick visual guide on setting administrative permissions and basic compatibility fixes: How To Fix League Of Legends Not Opening - NEW 2026⚠️ YouTube• Jul 2, 2025 2. Fixing "Critical Error" & Client Freezes