iqunload has two working modes: schema unload and migration.
Migration mode uses a special engine bundled with Sybase IQ 15 , and does not require any earlier versions of Sybase IQ. Schema unload mode requires that the database be running in an existing Sybase IQ server 12.6 ESD #11, or later, or Sybase IQ 12.7 ESD #5, or later. Schema unload is not supported with IQ 15 or later servers.