Users should be getting a notice to upgrade from GOSMS to GOSMS Pro, as the former will no longer be supported, but the Pro version is now free. On my Droid 2, it had a button to choose 'download' but nothing happened and I went to the Market to get the Pro version. I'd recommend uninstalling the regular version first. Be aware that you will have to go through the settings and change them back to your preferred ones. Both versions were rated highly, so I guess this is a plus for us.