Hi, first post here. I was excited about the feature of downloading lessons because we have crazy slow internet at our house and I can upload as needed at my office as needed on a Samsung Tab and bring it home for my son to take the lessons. Problem is, my fist attempt resulted in an error message that mirrors the title of this thread. This occured on both Chrome and Firefox and with multiple lessons. Ive tried exploring the forum and also google but with no luck. If i cant get this to work i wont be able to use this product and that would really bum me out. Thanks in advance.