Answer: You can always install a new build of Foxhound on top of an old one, and your data will be copied and upgraded.

However, in some cases you may be required to provide a new registration key after the data upgrade and installation is complete:

• A new Beta build can be installed on top of an old Beta build without providing a registration key.

  A new Beta build may push the expiry date into the future, but eventually the testing period will end.

  At some later date, another Beta testing period may begin, and for that you will need a new Beta registration key.

• A new Evaluation build can be installed on top of an old Evaluation build without providing a registration key.

  A new Evaluation build will not change the expiry date.

  Only one Evaluation period is allowed per customer.

• A new Basic build can be installed on top of an old Basic build, and a new Extended build can be installed on top of an old Extended build, without providing a registration key, until the "free upgrade" period ends.

  The end of the current free upgrade period has not been announced. When such an announcement is made, you may be able to use your "Original Full Build Number" to determine if you need a new registration key.

  Your Original Full Build Number is shown on the About page.

• You can also switch from Basic or Extended to Beta, and vice versa, when installing a new build. In each case you will be required to provide a registration key.

  When switching from Beta back to Basic or Extended, you will be able to use your original Basic or Extended registration key (until the "free upgrade" period ends). This allows you to participate in future Beta programs without losing the ability to return to your original activation status when the Beta period ends.

• An Evaluation copy may be upgraded to Basic or Extended, and a Basic copy may be upgraded to Extended, at any time by providing a registration key on the About page. This process does not require you to install a new build.

See also...
How do I restore the old build of Foxhound after installing a new build?