If you upgrade and install SDK 12.5.1 into an older SDK 12.5 Sybase directory where the 12.5 ODBC driver was installed (%SYBASE%\odbc), the installer updates the ODBC driver and you have immediate access to it.
Sybase recommends using your original ODBC driver directory
location.
If you choose to install 12.5.1 in a new directory on a machine that contains the older SDK 12.5 ODBC driver (in the old Sybase directory for ODBC), you will not have access to the new ODBC driver. Data sources used during installation store a hard copy of the absolute path to where the SYODASE.DLL exists. There is no utility that updates a Windows registry for the ODBC driver DSNs to update the reference to the SYODASE.DLL. If you change the ODBC driver location, you need to either copy the SYODASE.DLL and its related DLLs and components to the older Sybase directory, or change all your DSNs to use the new driver location.
