I downloaded the v28 *.md? today, converted to .ISO using UltraISO, burned to a Maxell CD-R at 2x with Sonic RecordNow DX, and loaded onto my 2003, E39, w/MK IV with no problems.
If at first it doesn't succeed, try it again . . .
Greg
2003 ///M5 Jet Black/Black, Sport
Beastpower Sway Bar Brackets, Bluetooth, Aux Audio Input & all "plus" options except PDC