To check for updates to ALP click the 'Updates' button. This button will inform you of the current ALP version you are running and will launch your browser to take you to the ALP updates page on the Mangolab website. You should only install patches with a higher version than the version you are currently running. E.g. If you are running version 1.4, then only install any patches higher than this, i.e. version 1.5 etc.
Alternatively, you can install Mangobot for free, to automatically update your product if/when new releases become available.
See also: What is Mangobot?