I have the same problem. Could someone give us an answer.
Thanks a lot.
Doesn't look like anyone wants to help. But if they do, I'd sure like some information on this myself.
In order for you to downgrade you need to hava an AVL license, and yes it is possible, you just need to call support.
"Adobe allows program members to order a current-version license but use a prior version. These members can contact Adobe Customer Service to request a serial number for the earlier version if they do not already have one. Prior-version software is available via ESD and can be purchased through standard resellers. The program member must follow all guidelines of the current-version EULA.
Note: This policy is applicable under the TLP and Forms Licensing Program (FLP) as well."
Hope it helps!