My League shortcut follows a sequence.
On the first load-up, it thinks it needs to install the game. I Alt F4 it, open the same shortcut, and the client loads as normal and I can log in, etc.
Then if I close it and go back to opening it, it goes back to wanting to install, until I close and reopen, etc. It follows this 1-2-1-2 pattern with 100% consistency.
Even just now, I went through the first 1-2, then the game said it needed to restart the client for an update. Instead of updating, it went back to the 1 sequence and tried to install. Then I reloaded it for the 2 sequence, and sure enough, it updated and I'm logged in now again.
Why the HELL is this happening???????