It is always recommended to use the latest version of Clientexec. Using the latest version allows you to benefit from the latest features as well as any bug fixes.
As of Clientexec 5.2.0 we have introduced the ability to update your Clientexec directly from your admin interface. Simply click the link at the bottom of your admin interface indicting "New Version Available" and follow the instructions.
If you run into any issues while running the upgrade, help is just a support ticket away.
We also offer an update service to update you to the latest version of Clientexec for a one-time fee of $35.