Sorry to hear you are having trouble. http 416 error is a Requested Range Not Satisfiable error.
Try to download the drivers using a different browser from the browser that you gave you the http 416 error (i.e. if you normally use Chrome, try Firefox).
Please let me know if you are still having problems.
Hy my problem match this. I'm try download the athoner broweser(crome,firefox) But no can download the new driver this the program. please help me
Sorry to hear that you are experiencing this same problem!
Another user reported that they were able to manually update the driver. http://devgurus.amd.com/message/1280031#1280031
If manually updating the driver doesn't help solve this issue, will you please file a customer care email? http://emailcustomercare.amd.com/
Again, I'm sorry to hear that you are experiencing this same problem.