You do not need to upgrade the Adaptive Server containing the RSSD to version 15.0 or later, before you can install Replication Server 15.5.
Disregard the following text in “Requirements for upgrading to version 15.5 and later,” in Chapter 3, “Upgrading or Downgrading Replication Server”:
You must upgrade the Adaptive Server containing the RSSD to version 15.0 or later, before you can install Replication Server 15.5.
