We find that some customers get upset if the previous version is automatically uninstalled during an upgrade. Therefore, we let the customer decide if they want to remove previous versions. You can uninstall previous versions via the Windows Control Panel.
Some customers do not want all of the previous files automatically brought into the new versions of Replay Media Catcher. However, you can easily add old files back to RMC6 either via drag & drop of via the Import command in the main menu.