This is really trippy, you know, I do have a legal copy of SC4 but all my attempts to register the product have failed. Then I decided to buy SC Rush Hour expansion pack for registration purposes only. Unfortunately, the last one didnt work either (serial number is invalid or already registered). The only problem I can think of is that I have two operating systems on my macbook pro - Mac OS X and Windows XP. I know that simcity.com doesnt accept Mac OS registrations. But does it still apply to Windows XP users if Windows installed on a macbook pro? Sorry if I asked a stupid question. Could anyone point me where could I download BAT and BAT update from? I would really appreciate anybody's help.