I have finally got an iphone and wanted to update B&M, for obvious reasons.  However, the update on the fiat site seems to be for windows only. Any Ideas??

The 5.4 update is for the B&M on the car itself (which is windows based) this in conjunction with the adapter sold allows for full functionality of the Iphone/Itouch with the car. It isn't something you down load onto your pc/mac to update. Does that make sense? Sorry had a few beers so might not be 100% clear  

All you need to do is down load the zip file and extract it onto a stick and follow the instructions, zip is cross platform so will work with any OS iirc. If you get error 10 trying to update the car it is already at 5.4 and you just need the adaptor.