You can ALWAYS start from www.amd.com , or here: http://support.amd.com/us/gpudownload/Pages/index.aspx
If you have STEAM for games it can tell you of an update. Also CCC (Catalyst Control Panel) has an "automatically check for updates" under "information-> software update."
CCC is in your System Tray (lower right) and looks like a little red ball with little grey things around it. If you don't see it, click the "UP ARROW"; if it's still not there it's likely not installed.