The “Engine Not Found” message is usually caused by or related to the permissions with which a user logs onto their computer.
For Windows users, the issue is actually relatively uncommon. For Mac users, it can happen more frequently.
STEP 1: The best first step for troubleshooting is to visit http://www.esellerate.net/update (our third party credit card processing company) and download the engine updater that corresponds to your operating system (e.g. Engine Updater for Windows) and run it. This will often resolve the error message.
However, if the error persists after running the engine updater, then I’d recommend that the user log onto Windows as an administrator account and try the process again. Once the engine has been installed successfully by an admin, that may also resolve the issue for non-admin users.