Serial Number for Registering at MasterCook.com and Activating Account I've purchased MasterCook 14, and I need to activate my MasterCook.com account. It's asking for a serial number. Where do I get that? How do I activate it? It depends on where you purchased MasterCook 14. After purchasing the download version of MasterCook 14 from our online store your account is activated automatically. You can verify your subscription end date on this web page: http://mastercook.com/app/ in the My Account section in the center of that web page. If you purchased MasterCook from a retailer or received MasterCook 14 in a retail package the serial number should be inside the CD case, under the section "ACTIVATING MASTERCOOK ONLINE" with instructions to activate your account at MasterCook.com. Register an account at MasterCook.com. Then go here: Activate Your Purchase to enter your serial number including the dashes in between. Have more questions? Submit a request 0 Comments Article is closed for comments.