Let me explain how to fix League of Legends not updating with several proven solutions.
I'll start with the simplest fixes and move to more advanced ones.
The simplest fix starts with signing out. Click the gear icon in the top right corner of the login screen and select "Sign Out."
Close the client completely, then reopen it and sign in again. This often solves most update problems.
Your antivirus might block the update. Open your antivirus software (like Avast or AVG) and enable Passive Mode temporarily.
Try updating League again. Remember to turn off Passive Mode after the update finishes for your security.
Running the game as administrator often helps. Right-click the League client and select "Run as Administrator." This gives the client proper permissions to download and install updates.
Sometimes game files need clearing. Close League completely and find your League installation folder.
Delete the "Downloads" folder, then restart the client. The game will check for updates and download fresh files.
For persistent problems, you might need a fresh installation. Uninstall League completely, download a new copy from the official website, and install it again. This fixes most stubborn update issues.
Always check your internet connection first. A stable connection prevents many update problems. Also ensure you have enough free disk space for the update to download and install.
If nothing works, contact Riot Support. They can help with specific account or region issues that prevent updates. Keep track of which solutions you've tried so you can tell support what hasn't worked.
I recommend trying these methods in order, starting with the sign-out method.
Most update problems get fixed by one of these solutions without needing a complete reinstall.