Ilir,
You can raise a TAC ticket to have them re-issue your activation key -23 SSL licenses, in any kind of failover setup - both devices must be identical in the following:-
The two units in a failover configuration must have the same hardware configuration. They must be the same model, have the same number and types of interfaces, and the same amount of RAM. On the ASA security appliance platform, at least one of the units must have an unrestricted (UR) license.
The licensed features (such as SSL VPN peers or security contexts) on both security appliances that participate in failover must be identical.
So either by more SSL licenses or downgrade.....all depends on if you are going to SSL at a later date.
HTH>
Andrew.