How can I hide / remove updates from the Mac App Store?

I installed an app, didn't like it, and then moved it from Applications to the Trash and emptied the trash. Now when I go into the App Store, I am stil being prompted to update the application even though it has been removed.

I tried searching the hard drive and I don't see any other copies of the Application.

I also tried running this command which is supposed to update the database of what is actually installed on the system for the App Store:

sudo /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user

It is still showing up. How can I get rid of it?

On a related note, I accidentally hid another update that I wanted to install by right clicking on it and choosing "Hide Update". I was not able to hide Clyppan which is the app I'm trying to ditch - but if you do accidentally hide something you want to install, how do you get it back?

Does it still show up in Launchpad? Or have you tried downloading the application again and removing it from Launchpad? It runs uninstalld, which doesn't normally remove many other files than the application bundle, but it probably makes some other changes.

Do you have an external drive attached to your mac? There might be a copy of that app on that drive (eg if it were a backup or clone of your main drive).

Alternatively, try going to the 'Purchases' tab, find that app in the list, and right-click > Hide Purchase... and see if that stops it from showing up in the Updates list.

From the Mac App Store help, to see hidden purchases do this:

To view hidden apps, choose Store > View My Account, enter your Apple ID and password, click View Account, and then click View Hidden Purchases. To show a hidden app in the purchased apps list, click its Unhide button