I have just upgrade, my activation is gone. It is also possible that the activation is gone after migrating to new system disk (to SATA, with mirroring disk utility). How can I get my software back up and running?
Yes, changing your system disk will invalidate the activation because the fingerprint of your machine has changed.
You should deactivate the license before changing hard drive.
Regarding you case, please contact our email@example.com with your product key so we can help deactivating it then you can use that product key to activate again.