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You should uninstall your current McAfee software before using those.
Outline here: TS101331
You'll need one code/license immediately to activate that machine.
You can hold on to the others and use them at a later date as long as there is no expiry date written on them.
Even if such a code is old you will always receive the latest version of whatever software is in question, because the installer always downloads the latest version from the web.