If this falls under the "glitch" then I didn't mean to do it. But, I think I might have got the maps for free.
Signed into Halo 2.
Needed an update, because I wasn't at 1.5.
Signed back in. Couldn't get to Live in the game.
Realized I needed a Gold account.
Used a 48-Hour Trial on my Gamertag.
Signed back into Halo 2.
Went to the downloader.
Tried to download the pack.
Authorized them to charge me for the pack.
Got "denied" and told I "wouldn't be charged" for the attempt.
Backed out and tried to go back in.
Got to the downloader and this time it went through. (Don't know if I was charged.)
Again, I had no intention of getting these maps for free. (I used the same account throughout the process; I don't even have other accounts on my 360!) It is possible that I did get charged for them, but from the looks of it, I did not.