I installed and uninstalled MPlayerX (didn't like it). Since then, a macOS notification will pop up every now and then, prompting to download "djay Pro". I've tried installing and uninstalling MPlayerX again, just to see if there are any options to remove the notification, but there appears to be nothing. Any advice would be greatly appreciated. By the way, if anyone is thinking of installing MPlayerX, don't. I ended up with Mackeeper after the install (which did not even hint at Mackeeper being installed). I used AppCleaner to remove Mackeeper.