In order to update to your RSForm! installation just go to "View my downloads" area (make sure you are logged in) and download the com_formeJ15.zip file. After you have done this just open your Joomla administrator panel, go to Extensions > Install/Uninstall, browse the previous downloaded file and click Update and Install.
This will only update your current RSForm! installation, it will NOT erase your current RSForm! data.






