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Make sure you've run through all of these steps,
The Launcher stops downloading 1. Let the Launcher run for up to 15 minutes
2. Restart the Launcher
3. Power Cycle (restart) your modem and/or router
4. Make sure that lol.launcher.exe is listed as an exception in your firewall
5. Temporarily disable firewall and anti-virus software.
6. Click on the "Options" button in the lower left corner, then hit "save"
7. Visit the Launcher Troubleshooting Page in the KB
If it's still not working, come on back with your patcher logs.