Where can I retrieve Red Giant serials purchased from redgiant.com?

To retrieve serials from Red Giant's website (which was discontinued mid-2021), you can access them from the Legacy Licenses section of my.maxon.net under the "Manage" section after signing in or setting up an account with the same email that was used to purchase them from redgiant.com:

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If you purchased your products through another vendor, we, unfortunately, cannot track that information, and you will need to contact that vendor for your order information.