try to reinstall league if you have been screwing around with other hack tools (or the hotfix for league of legends.exe)
unzip the camera tool, start a game normally and when you have loaded in (welcome to summoner's rift) run the camera tool as admin
then you can use it to zoom out
close the tool after the game, and reopen (as admin) when next game welcomes you to the map.
Side effects: you might have to play it by ear (my game client goes all fucky and only plays sound with a weirdly glitched window until the camera tool is opened again), but it works 100%
it's very much detectable so don't risk a valuable account but that goes without saying