Yep, installed fine for me by bypassing the first installer. Extract the zip file, then open an elevated command prompt (run as administrator).
Then cd C:\Users\(Username)\Downloads\BootCamp5.1.5621\BootCamp\Drivers\Apple
bootcamp.msi
Installed fine, gave me the BootCamp control panel, and my function keys work to change the brightness on my cinema display in Windows 8.1 64 bit.