If your old computer is still semi-functional, the serial number is stored in the Windows Registry. Open the Registry Editor ( regedit ), navigate to HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\PeachTree\Flavor , and look for the serial number string.
Are you open to exploring if the legacy software fails to run? Peachtree 2013 Serial Number
The serial number is sensitive to spaces and formatting. Re-type it carefully. If your old computer is still semi-functional, the