Reinstalling old version of Acrobat as upgrade without original license code
I recently had my operating system upgraded to Windows 10 and am trying to re-install an old version of Acrobat (Version 9) from a disk. The serial number is included on the package, but it is itself an upgrade from an even older version, and Adobe needs to know the serial number from the original product, which I no longer seem to have. Is there any way around this problem without my having to purchase a newer version of Acrobat?