My 1 year renewal is set to expire tomorrow (8/20/2016).  I decided a couple of weeks ago to run an update on the software to keep it current before expiration (I know now that the updates are free going forward, which is fantastic - Big thanks Autel!).  Anyways, I updated all available updates.  When I attached the MD802 to the vehicle, it wouldn't connect.  I attempted this on multiple cars (& manufacturers).  Had the same issue.  Always stuck at "waiting".  THE FIX - I deleted the files (NOT THE FOLDERS) in the SCAN directory folder.  File names deleted began with "Authorization" and ended with "Version".  I then opened the Autel Update software.  It updated the system files.  Hooked up to a vehicle, and everything works perfect now.  2-3 minute fix and all the updates are there.  Hope this helps someone that has a similar issue.

 In windows explorer, a file folder has a folder icon to the left of the name. You can also sort by type and delete everything that is not a file folder.  This will include Bin files, Configuration settings, and text documents.

What kind of problem are you experiencing?

 You might try to delete your vehicle's manufacturer and re-install.  However, just because your vehicle isn't starting, that doesn't necessarily mean that you should have a code present.  Assuming you have compression and your timing is correct, you still need fuel and spark.  If you have a faulty fuel pump (for example), you probably wouldn't have a code present, but your vehicle wouldn't start.