You have downloaded SCSI driver version 4.1 for the Adaptec AHA-8945CP Macintosh board and PowerDomain Control Utility v5.0.1.
Before flashing your 8945CP with this release, please run the PowerDomain Control Utility (v1.0, 2.0, 2.5, or 3.0 - whichever one you have) and set all board options to defaults.
After flashing the 8945CP with the 4.1 driver, you must use PowerDomain Control Utility v5.0.1 in order to change board options.