View source for Anniversary Edition/Installer/Updater

The Anniversary Edition Installer 2 (AEI2) can check for updates to mods/patches and offer to install them. But how does the AEI2 itself get updated? The answer is the AEI2 Updater (AEIU for short), which is a separate Java program. When the AEI2 launches, it checks a [[wp:Version control|version control]] repository to see if an update to itself is available. If so, the user is prompted to install the update. The AEIU is then launched, which performs an update on the AEI2 executable and related files and then relaunches the AEI2.

The AEIU itself has required a handful of updates over time. Since the Updater cannot update itself, a user will have to re-download the AE's Setup application to obtain the newest Updater, and thus the Setup app's version number is advanced whenever the AEIU is updated.
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