Hi there!

Is Z3TA + 2 still available? 
 

Depends on what is meant by available.
 
Gibson suspended sales of all Cakewalk products in November 2017. Existing owners of Z3ta +2 may download and activate it using Cakewalk Command Center.
 
No one from BandLab has discussed plans for Z3ta +2.

If you google it you will find several sellers who will sell you a serial number at a very good price. The trick is that you will have to redeem the SN by setting up a Cakewalk account if that is even still possible. The last time I checked a new account is required to validate the SN and creation of new accounts was disabled. So are you feeling lucky?