Do I have to update the EJOB.jar client if I upgrade to the latest version of the JDBC-ODBC Bridge?

Yes. It's always best to run the same version of the client and server. Incompatibilities between versions can cause problems. The EJOB.jar location is:

drive\Program Files\Easysoft\Easysoft JDBC-ODBC Bridge\jars (Windows. Default installation location.)

–Or–

installation_dir/easysoft/job/jars (Linux and UNIX. Default installation_dir is /usr/local.)

Remember to remove EJOB.jar file from all directories on your client machine as different applications load the driver from different places.