First of all:When you download the ISO Burn it to a DVD With Ultra ISO
Install notes:
1. Burn it into a dvd or mount with daemontools
2. Start install
3. Finish install of Visual Studio '08 and start install of MSDN
4. Finish install of MSDN
5. Go to add & remove programs
6. find Visual Studio ENU
7. press change or remove
8. You should be in matenience mode
9. Enter the magic key into the upgrade box
10. Exit and your done