The previous versions of MasterCook were created by previous companies that owned the product and are no longer supported. We do not have access to their activation codes, etc.
If you read the message given to you, you will find it's from Digital River. You need to contact them. See here:
MasterCook 15 is the current version. It does NOT require an activation code to install. You can purchase it at www.mastercook.com. It comes with a free one-year subscription to MasterCook.com which allows you to sync your recipes from version 15 to your MasterCook.com account.
Furthermore, we have mobile apps for Android and iOS that are FREE and will sync with your content at MaterCook.com and MasterCook 15.
You can merge your content from a previous version of MasterCook as explained here: MasterCook 15 Merge
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