To install your McAfee in other devices, you must use the same license that was activated in the first one. There is no need to redeem or use other codes, because your product is already registered in your McAfee account.
Therefore, you must access your McAfee account through home.mcafee.com and log in with the email and password you created in the first installation. On the screen, the "download" button will be available to download the executable file of your McAfee. Then, run the file and follow the instructions that will appear on the screen.