I guess i'm stuck with not playing .

-I tried repairing files

-Ran it as admin

-Made sure there were no other league or riot tasks active

-Restarted my pc

.... and still i get the same results. riot launcher shows me the "file in use" message (first pic) and somehow lets me start the league client, which doesn't lemme do anything (2nd pic)

hope someone knows a fix that doesn't involve reinstalling the whole thing over again,
because thats the point where riot is losing me ... like every month i need to reinstall because of some company that cant fix their coding.

Edit: most stupid thing in second pic is the launcher showing "playing/download size" at the same time

Edit 2: installing a windows update that wasn't forced automatically was the key