Every time Peaya Paper launches, it will check if a newer version exists. If yes, you will be asked if to update. Exception is when the update is critical; in this case the update is automatic.
Important! To users who use Peaya Paper prior to version 2.0: You need to completely uninstall Peaya Paper first (see how), and then install the new version. Otherwise, the update will fail and end up in an infinite loop. If this happens, you should kill the Adobe AIR process in the task manager of your operating system.