The community-led ATLA Remastered in 1080p project, often referred to as the fan remaster, is primarily distributed via community forums due to its unofficial nature. Accessing the Fan Remaster
The Avatar: The Last Airbender: The Complete Series Blu-ray is widely considered the best official way to own the show, as it provides the highest bitrate and consistent 1080p quality. atla remastered in 1080p link
For $44.99, you can own the entire series on Blu-ray. This is the closest you will get to a perfect official release. Plus, you get special features (commentaries, behind-the-scenes) that the fan remaster lacks. The community-led ATLA Remastered in 1080p project, often