- Home
- League of Legends
- Errors and problems
- Error code 004
Error codeLeague of LegendsWindows PC
League of Legends: "Error code 004"
Patch failed to download or install
The client says patching failed and asks you to restart. Riot says this usually happens when the Riot Client lacks permissions, disk space or network access for the update.
How to fix "Error code 004"
Fully close the Riot Client, including from the system tray, and open it again.
Restart your PC.
Run the Riot Client as administrator.
Free up space on the drive where the game is installed.
Let the Riot Client through your firewall, and reinstall the game if nothing else works.
From League of Legends's help pages: support.riotgames.com, in our words. Checked on 11 November 2026. If the steps do not help, League of Legends's own support is the next stop.
More League of Legends errors and common problems
- Can't log inWrong region, clock out of sync or DNS
- Attempting to reconnectConnection drops during a match
- Lag and low FPSWeak hardware, heavy settings or old drivers
- Won't start after champ selectSecurity software or old settings block the game
- Black screenGraphics, firewall or game files get in the way
- Game crashesCrashes or freezes with no error code
- VAN 68Vanguard lost its connection or session
- VAN 57Riot Vanguard is not running
- VAN -81Vanguard trouble starting or staying connected
- VAN 9003Secure Boot is turned off
- Unexpected error with the login sessionAnother client copy stuck in the background
- VAN 1067Vanguard hit an error checking your system
- VAN 0Vanguard couldn't verify your PC
All League of Legends errors and common problemsLive League of Legends status