If you're seeing "Failed to Launch" and/or "Something Unusual Happened" when trying to start or update a Riot game, it usually means something is preventing the game from launching properly on your PC.
This can happen due to:
- Corrupted game files
- Incomplete or outdated installations
- Driver issues
- Background programs interfering with the game
Below are some steps that can help resolve the issue.
Disabling DevOverrideEnable in Windows Registry
Important
Editing the Windows Registry can cause system instability if done incorrectly. Please follow these exact instructions and only modify the specified values. If you are uncomfortable doing this, we recommend asking a computer professional for help before proceeding.
Vanguard requires DevOverrideEnable to be disabled as this setting can interfere with system integrity checks and may prevent the Riot Client from installing, updating, or launching games.
Follow the steps of this article to ensure DevOverrideEnable is set to 0 in your Windows Registry: Deactivating DevOverrideEnable in Windows Registry Editor
Perform Clean Boot
Clearing up background processes can ensure other programs aren't fighting for the spotlight against your game.
We have a handy guide ready for you: How to Perform Clean Boot
Add exceptions in your Firewall
Check out our Connection Troubleshooting Guide (PC) article for detailed steps on how to provide exceptions for the game and the Riot Client.
If you're running a third-party antivirus, temporarily disable them to see if the issue persists.
Update your graphic card driver
Not sure what the steps are? Consult our guide on Updating Graphic Card Drivers for a detailed help.
Reinstalling the game and Vanguard
If the steps above didn't solve the issue, follow our guide on how to reinstall the game and Vanguard.