If you find yourself needing an older version of Architect you can find a link below.

If you are reverting because you found a bug, please let us know on our bug forum:
http://www.sencha.com/forum/forumdisplay.php?97-Sencha-Architect-2.x-Bugs

Older Architect 3 versions can be found here.

Architect 2.2.3 previous version:Architect 2.2.1 previous version:
Architect 2.1 previous version: