How to Update Version 2.1

Could somebody explain to me how to update earlier versions. I have use version 3.1 which is kind of ancient. It works OK but sometimes the recorded sound is distorted. I'm hoping an update would make the difference.

I don't see a page with updates -- it seems there are only the newest versions. That would be OK to update if my old serial number will work.

Replay Music has a free update to the latest version. Uninstall what you have and reboot prior to installing.

http://www.applian.com/replay-music/demo.php