I could not get the file to upload at all to the pinball machine until I converted the file with WinZip. I tried 3 times and failed uploading vis a USB stick to ACDC until the winzip program was used. It actually says that on the Stern page as well.  You must have had WinZip or a similar program already installed on your computer.  You can download the gamecode to the drive or anywhere on your computer without WinZip, but the gamecode has to be converted with Winzip or it will not upload at all.