OK! Now we're getting somewhere.
that's not the way you open it in MC. you have to have MC already open. then you have to insert it as an FX in the FX bin of an audio track just like you would any other FX. have you ever inserted an FX into the FX bin? if not, and you don't know how, I strongly encourage you to work thru the tutorials and the getting started guide in the help files.
in the meantime, you need to go to an audio track in MC. I assume you have an audio track which needs some vocals to be corrected, right? load that project, go to that track which has the vocals in it and right click in the FX bin. then choose AUDIO FX>AUTOTUNE (it may be listed in a sub-menu). if it's anywhere to be found, then we'll have to back up and set up MC to know where to find it as a VST and scan it before you can use it.