Is simple like that. I had some issues to be able to log in, with a lot of effort i could do it, however, my launcher update to the new one, i was still able to log in, but now, when i try to do it, the game simple crash and show up a message that say " league of legends stop workin, do you want to wait or force quit?"
Same issue for me 
Did you manage to resolve it?
still dealing with this 
Looking at the log this seems to be the error:
006a:err:ole:CoUninitialize Mismatched CoUninitialize
Did anyone face this before?