To upgrade, just uninstall the previous version, all datas are preserved. Install the latest version, then go to in admin panel, check and save the general configuration. If you have create a menu linked to AlphaRegistration (optional) Go to in menu manager and edit each menu linked to AlphaRegistration and save again.

There have only for install. Upload packages from this website. Go in your Joomla administrator panel, choose the menu Extensions -> install/uninstall . Select packages by clickling on "upload and install" button.