We are currently planning our clarity upgrade from 14.3 to 15.3. We will be installing the PPM 15.3 version on a brand new box.
Can we start our installation on the new boxes from 15.2.0 base version? or do we have to go back and follow a specific upgrade path from a specific base version?
For upgrade planning recommend if have not already review the Change Impact and Upgrade Guide for supported upgrade paths for Release 15.3.
Change Impact and Upgrade (On Premise) - CA PPM - 15.3 - CA Technologies Documentation
For example Supported Patch Level for Upgrade > Patch 14.3.0.10 on the base version 14.3.0