The necessary files are in the Unibeast drive. You can copy them from the terminal.
Boot into the installer and click on Utilities->Terminal
write command: diskutil list
to list all your drives and their names then to copy:
cp -r /Volumes/(name of your Unibeast drive)/Extra/Extensions/'NullCPUPowerManagement.kext' /Volumes/(name of your Mavericks disk)/System/Library/Extensions/
To navigate to your USB or your Installed disk use command : cd /Volumes/(drive name)
To show files in current directory use : ls -al
You can copy any kext you want this way.
Hope it helps