I just downloaded and installed VDF16. I registered for the Personal edition. Got this response.
Your Visual DataFlex Personal Edition registration was successful!
Your registration information is being sent to the e-mail address you supplied during registration.

The codes I received did not allow me to register. It recognized my email address and sent me a serial number of 417006, with my Business name and a Product code. That may be from another license.

The message I get is "Cannot find installed product for the license.." I tried this during the install and after the install.