Hey, Lokey!
That sounds strange, indeed. You might try using a tool like
CleanMyMac to perform a deep scan of installed applications to check for an existing installation. Since it doesn't show in the application folder, I assume that the installation is broken for whatever reason, so you might want to uninstall it via that program.
For future subtitle downloads, I'd recommend either unchecking the OS Downloader checkbox or using our new tool,
FlixTools, which is also available as a free version for the sole purpose of downloading/uploading subtitles from and to OpenSubtitles.
It works like a charm and personally I've been using it ever since the first beta was released. You only have to drag and drop your existing movie file into the UI and it automatically searches the OS database for fitting subtitles based on the movie file's metadata.
If there's anything else, please don't hesitate to reply or drop me a message.
Cheers,
kazekira