Identify the RMI port for each component before running the migration installer.
For Publishers and Subscribers, the RMI port is located here:
<RAP_R3_Installdir>/<component>/ua/plugins/com.sybase.rap.rapservice/agent-plugin.xml
For RAPStore, the RMI port is located here:
<RAP_R3_InstallDir>/<component>/ua/plugins/com.sybase.rap.iq/agent-plugin.xml