Originally Posted by Nubster
Only a trial version.
There's a code that you have to find (a quick google search
will do) and then you go to the redeem page: https://shop.popcap.com/zombiemouth/redeem
Enter a legit email and they will send you the activation code and a download link for the trial.
The activation code they send you in the email will make it a registered game. Not a trial.