Thanks ever so much for the reply.
I'm having real fun with it still though. The guys at audiotec fischer emailed me the latest files and when I unzipped the file it was the same as I had already downloaded. I made sure the SD card was named VW_SOUNDSYS (I've tried without the underscore too) but when it tries to self execute it says it cannot find the SD-CARD. I reckon it must be an issue with my laptop because it doesn't have a standard SD card slot and I have to use a card reader(this might mess up the path somehow).
I will try my son's pc to see if there is any joy but if not I think I just need to try to get a copy of the files themselves to copy onto the SD-Card.
We'll keep trying and smiling, thanks again for your help though.