Question:
Is it possible to upgrade from CA IDMS r12.0 to r18.5 or r19.0?
Answer:
Yes, in the r18.5 and r19.0 CAISAG.CONFIG(VARBLIST) you will see this:
FROM#REL = 18.0 FROM WHICH RELEASE ARE YOU UPGRADING?
* (12.0, 14.0, 14.1, 15.0, 16.0, 17.0 or 18.0
It defaults to the from release of 18.0 but it goes as far back as 12.0.
Additional Information:
CA IDMS Installation Guide - MVS