In that case does that mean I have to upgrade all my clients first as well?
Or can I upgrade to 12.1.2 then to MP1 directly after, and allow the clients to pull the latest release?
So I install this package first,
Symantec_Endpoint_Protection_12.1.2_Part1_Installation_EN.exe
then i can install this one,
Symantec_Endpoint_Protection_12.1.2_MP1_Part1_Installation_EN.exe.
This of course will need to be done all 3 Endpoint Protection Managers that connect to the single SQL database.