Upgrade aMember Pro to newer version
From AMember Pro Manual
If you are upgrading inside a branch (for example, from 3.0.2 to 3.0.4, go to Members Page), you will be able to download an "upgrade kit" for your version (in your case you would need a kit for 3.0.2). You will also find upgrade instructions near the download link.
If you are upgrading from 2.x.x to 3.x.x, then upgrade procedure is little more compex, and described here