Embedded Replication Server System Database (ERSSD) requires Sybase SQL Anywhere, which is compatible with 64-bit versions operating system.
If you are upgrading to Replication Server 15.6 on Sun Solaris SPARC, Sun Solaris 10 x86-64, or IBM AIX, and using ERSSD, platforms must be 64-bit for the upgrade to function properly. For these operating systems, ERSSD can only be run on 64-bit machines. This is a restriction of the underlying SQL Anywhere database.