The Sybase Central ASE plug-in is no longer included in the Adaptive Server installation image. Use Sybase Control Center 3.2.8 to manage your Adaptive 15.7 SP100 servers.
Sybase no longer maintains Sybase Central. However, if required, you can download Sybase Central plug-ins by going to the http://www.sybase.com/downloads site, then clicking Maintenance Releases and Bug Fixes (EBFs).