OpenSwitch version 15.1 requires Open Client/Open Server version 15.0. If you are installing OpenSwitch on the same machine as other Sybase products (such as Adaptive Server Enterprise, Open Client/Open Server, or Replication Server), Sybase recommends that you install OpenSwitch in a separate directory.
WARNING! Installing Open Switch version 15.1 into its own directory changes the definition of the %SYBASE% environment variable, which affects other Sybase products installed on your machine that rely on the setting of this environment variable. Execute SYBASE.bat to set the user-level environment variables.