League not compatible with Windows 10

i have windows 10 and it runs fine for me. maybe its not the windows but your computer

it'd be your computer. Numerous people run windows 10 now (myself included) and league works fine for everyone. Riot even stated it's compatible.

try going into the properties and running it in compatibility mode for windows 10. then right clicking the shortcut and running in administrator mode.

Go into the League of Legends install folder and launch from lol.launcher.exe. I have had this happen after pinning the launcher to the taskbar. If you works you can right click the launcher and make a new shortcut on the desktop.