Many League of Legends players face an issue where the update gets stuck on “Checking size” in the Riot Client. As a result, the game never starts downloading, and the launcher appears frozen.
Fortunately, this problem usually happens due to cache corruption, network issues, or client conflicts. In this guide, you’ll learn why the LoL update gets stuck and how to fix it step by step.
Why Is the LoL Update Stuck on “Checking Size”?
Before applying fixes, it helps to know the cause.
Common reasons include:
- Corrupted Riot Client cache
- Network or DNS problems
- Riot servers under heavy load
- Antivirus or firewall interference
- Outdated Riot Client
- VPN or proxy conflicts
- Insufficient disk permissions
Because of these issues, the client fails to calculate the update size.
Fix 1: Restart Riot Client and PC
First of all, restart everything to clear temporary glitches.
Steps:
- Close League of Legends and Riot Client
- End all Riot processes from Task Manager
- Restart your PC
- Launch Riot Client again
In many cases, the update starts downloading immediately.
Fix 2: Run Riot Client as Administrator
Permission issues often block update checks.
Steps:
- Right-click Riot Client
- Select Run as administrator
- Check the update status again
As a result, the client gains full folder access.
Fix 3: Clear Riot Client Cache
Corrupted cache is one of the most common causes.
Steps:
- Close Riot Client completely
- Press Windows + R
- Type:
%localappdata%\Riot Games - Delete the Riot Client folder
- Restart your PC
- Open Riot Client again
This forces the launcher to rebuild fresh data.
Fix 4: Disable Antivirus and Firewall Temporarily
Sometimes, security software blocks Riot services.
Steps:
- Temporarily disable antivirus and firewall
- Launch Riot Client
- Check if the update proceeds
💡 If this works, add Riot Client to antivirus exclusions instead of keeping protection disabled.
Fix 5: Turn Off VPN or Proxy
VPNs often interfere with Riot servers.
Steps:
- Disconnect VPN or proxy
- Restart Riot Client
- Try updating again
Consequently, the client connects properly.
Fix 6: Change DNS Settings
DNS issues can slow or block update checks.
Steps:
- Open Network Settings
- Change DNS to:
- Preferred: 8.8.8.8
- Alternate: 8.8.4.4
- Save settings and restart
Afterward, check the update status again.
Fix 7: Check Riot Server Status
Sometimes the issue is server-side.
Steps:
- Visit Riot Games Service Status
- Check League of Legends update services
If servers are down, wait until Riot resolves the issue.
Fix 8: Free Up Disk Space
Low storage can block update size checks.
Steps:
- Open This PC
- Ensure at least 10–15 GB free space
- Delete unnecessary files
Then restart the client.
Fix 9: Reinstall Riot Client (Last Resort)
If nothing works, reinstalling helps.
Steps:
- Uninstall Riot Client and League of Legends
- Delete leftover folders:
C:\Riot Games %localappdata%\Riot Games - Restart PC
- Download and install the latest client
This removes all corrupted files.
Additional Tips
- Use a stable wired internet connection
- Avoid background downloads
- Keep Windows updated
- Do not install LoL in protected system folders
Frequently Asked Questions (FAQs)
Why is my LoL update stuck on checking size?
Usually due to corrupted cache, network issues, or blocked Riot services.
Does reinstalling fix the issue?
Yes, reinstalling works when cache and files are heavily corrupted.
Can Riot servers cause this issue?
Yes, server overload or maintenance can stop update checks.
Is this issue region-specific?
Sometimes, depending on server load and routing.
Conclusion
The LoL update stuck on “Checking size” issue is annoying but easy to fix. By restarting the client, clearing cache, disabling VPNs, and checking server status, most players can resolve it quickly. However, if the issue persists, reinstalling the Riot Client ensures a clean setup.
🎮 Get back to Summoner’s Rift without update delays!
