Thanks for the responses guys, I appreciate it.
Having a MAC can be bit of a problem this way. I bought a VADIS CD for my Volvo S80 from some schmuck on ebay which didn't work (got a copied DVD instead of the "genuine" item advertised and it wouldn't open at all on my MAC like he told me it would). Even a computer programmer at work couldn't get it to run on his blitzed-out monster PC. So I need to be sure whatever I get will work before I buy it.
I'll check the sites you guy posted so far. I'm a die-hard MAC user but I guess I could borrow my kid's laptop PC if I had to (I'd almost rather ride a bicycle!, almost).