Don't download the floppy version then.  You can update it from within the OS (make sure to update the driver first): www.dell.com/.../DriverDetails You can also use SUU (Server Update Utility) DVD ISO to update it from the OS or together with SBUU (Systems Build and Update Utility).
I downloaded a firmware update for a cerc 6 sata raid in my PE1800 . When I run the update it says it can't find a floppy, cause I don't have one. Sure this is a common problem with a common answer....
update firmware on cerc card requires floppy