Reinstall following Apple replacement

Can anyone pleas help... I've seen details about needing to unattach the licence on the Mac prior to swapping device - unfortunately my MacBook Pro was replaced by Apple as they couldn't repair a fault - after they attempted to do so by replacing the logic board and wiping data... I now have a new MacBook but would appreciate advise as to how I can install the products I've purchased...

Cheers!!!

 

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