I've recently migrated to Mountain Lion. Every now and then I get a Growl notification saying that a new version of Growl is available. The new version is a paid app, which I don't want to buy, but I can't find a way to disable the update message. It's particularly annoying because unlike a normal Growl notification, this one doesn't go away until you explicitly close it.
If there isn't a way to disable this intrusive advert I will simply remove Growl from my system - but this would be a shame as the current version is still somewhat useful. (Not every program I use supports the new message centre.) So does anybody know of a way to disable this specific message?