If you've installed the latest Auto-Align Post 2.2 but you're not seeing it in the Pro Tools ARA plugin box, please delete AutoAlignPost.aaxplugin from

/Library/Application Support/Avid/Audio/Plug-Ins/

(In Finder, you can press command+shift+G and then paste the location above).

After you've deleted the plugin, run the latest AAP installer again.
If this didn't help, please send us a message to [email protected].