If you want to download the maps separately, you can get them here!
Dungeon of The Dead Three: Bathhouse
Dungeon of The Dead Three
The Low Lantern
Under The Villa
[“Descent into Avernus: Chapter 1 is unofficial Fan Content permitted under the Fan Content Policy. Not approved/endorsed by Wizards. Portions of the materials used are property of Wizards of the Coast. ©Wizards of the Coast LLC.”]