Learn how to determine the version of Adaptive Server you are currently running.
Verify that your current Adaptive Server installation is at version 15.x by running the following query from isql:
1> select @@version 2> go
If your server is not running, you can get a version string by running:
$SYBASE/$SYBASE_ASE/bin/dataserver -v
You must source environment variables before executing dataserver -v.
If this shows that the Adaptive Server is not at version 15.x, you must upgrade Adaptive Server. See Upgrading Adaptive Server.
If your server is at a 15.x version level, you can begin installing Adaptive Server 15.5.