EDITED A COUPLE HOURS LATER:
I finally found the installer but getting this error:
objdump -m i386 binary -D 2BB5AFA9-FF33-417B-8497-CB773C2B93BF_1_479.ROM > pm
$C:\MinGW\bin\objdump.exe: 'binary': No such file
When you load the ROM in MMTool, the module will actually be called "PowerManagement"
As for the error you are getting, looks like you're trying this under Windows. I used Linux as objdump is already installed in Ubuntu. Try downloading an Ubuntu Live CD and just boot from the CD and have the ROM on a usb flash drive.