rheathcote,
For Activations purpose, it doesn't matter what version you are using. (though if you want to know, you can start PlanetPress Workflow, and the pop-up will tell you if you have Watch, Office or Production)
Regardless, you will need to contact activations, and send them the new magic number(it will appear in the box where it asks you to enter a new activation code). You can email them at activations@ca.objectiflune.com, or call 1-866-348-5863 and ask for Activations. They will be able to assist you in giving you a new code.
Regards,
Raphaël Lalonde Lefebvre