There are several requirements for the site, route, and system versions, mixed-version environments, and different platforms, when you upgrade Replication Server.
If a replication system domain has Replication Server 15.7.1 SP100 and later, then the system version and route versions in the replication system domain must be version 12.6 and later.
If the Replication Server version, the site version, and the route version are earlier than 12.6, you must upgrade Replication Server to version 12.6 or later, set site version to 12.6 or later, and upgrade routes to 12.6 or later, before you can install Replication Server 15.7.1 SP100.
ERSSD requires Sybase SQL Anywhere. SQL Anywhere version 12 included with Replication Server 15.7.1 SP100 is available on: 64-bit Linux, Solaris SPARC, Solaris x64, HP-UX Itanium, and IBM AIX platforms. The ERSSD and Sample Replication Server, and the ASA12 folder are not available on 64-bit Linux on POWER (IBM pSeries).