Chief Architect X12 Product Key Link

Run the Chief Architect X12 installer. Launch the Program: Open Chief Architect X12.

If you have upgraded from a previous version, you can still find your old keys. At the top of the Digital Locker screen is a check box labeled "Show upgraded product keys" . Checking that box will show download buttons for your older versions, including X12. This will allow you to download the installers for your older versions. Chief Architect X12 Product Key

This happens if you leave Chief Architect running on another computer. Run the Chief Architect X12 installer