Following are tasks that you need to perform before you install any Sybase software into a directory in which Sybase software is already installed.
Create a backup of the existing installation directory and, if possible, the environment variable settings and registry.
On all platforms, when you install Sybase products into a directory that contains other Sybase products, the installer overwrites existing files with the same name. If the files on the system are newer than the ones being installed, the installer prompts you to specify whether or not to overwrite the existing files. In most cases, you want the newer version of the files and should choose not to overwrite newer files.
On Windows, if Sybase products are installed and you install another Sybase product into a different directory on the same machine, the system variables (such as, SYBASE) are reset to the directory where the last Sybase product was installed. Thus, any Sybase products that were on the system before and were configured to run as Windows services may no longer run automatically and may not be manageable through the Control Panel service controls.
To correct this problem, run the previously installed products from within a DOS command shell, or create scripts that set the environment and run the product. When using a DOS command shell, run the environment scripts, such as SYBASE.bat, for that product before running the product to set the variables correctly.
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