groove ip app

I downloaded and installed the Groove IP app for my Galaxy S II GT-I9100 smart phone and it worked fine, however, it cannot be updated and so I have uninstalled it. Now, I tried to buy and install the Groove IP app with the latest update version from the android market and it will not install. An error message says that the app is already "Purchased" and installation is blocked. Would someone please assist me in getting rid of that error which is preventing the download and installation of the android market version of Groove IP even though I have uninstalled the free version from this site.