The first update is a system program Update 5.04 which you are forced to download first before any car updates. The Sys 5.04 is the problem. If all you downloaded was the Sys 5.04 update, you can go into the scan folder on the sd card and delete all the files from Authorization.txt through Version.txt. Do no delete the folders, just the files. Now restart the Autel update program and let it re-authorize the card.
If you also downloaded any car updates after installing the Sys 5.04 update, deleting the files in the scan folder and re-authorizing the sd card will not work.
I have already emailed US Autel support about this problem and am waiting for a solution.
The first thing anyone should do when they first get their Autel is to create a backup of the SD card and save it on their computer. DO NOT do any updates before you backup the SD card!