These question has been asked so far:
1. How do we know what agent version is compatible with ZDU?
2. Explain the process of the way CP’s are upgraded at the time of ZDU Wizard Processing?
1. ZDU (Zero Downtime Upgrade) is update Core Automation Engine component CP/WP, Database ,
So all the agent would be compatible with the ZDU
2. Please check these video below for the concept and how it works
and in V12
I also suggest to revisit the old topic that we have many contributed ideas on how to perform the ZDU smoothly