what is the download key for?
From the F.A.Q. above:
I see keys in the MoonQuest package. What are they for? Whoops, ignore those! They were for a legacy version of MoonQuest and are no longer needed.
You should be able to delete them from the "external keys" page if you don't need to hand them out anymore. Click on the page that takes you to the listing and scroll way down. Tell me if you have any issues.