Where can you download all Fullmetal Alchemist brotherhood episodes HD at once?

Unfortunately, there is no official source where you can download all Fullmetal Alchemist: Brotherhood episodes in HD at once. The series is available for streaming on several platforms, including Crunchyroll, Netflix, and Hulu. However, you would need to purchase individual episodes or a subscription to access them. Additionally, downloading copyrighted content without permission is illegal and is not recommended.