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.

For upgrade, no needs to uninstall the previous version. Just install the latest version, then go to in admin panel of AlphaContent, check and save the general configuration if new settings.

If you want uninstall the previous version before, you must before save a copy of the file configuration.php in administrator/components/com_alphacontent/configuration/. Then, just uninstall and install the latest version. Replace the file configuration.php previously saved. Check and save the general configuration in admin panel. Go to in menu manager of Joomla! and edit each menu linked to AlphaContent and check and save all settings.