I have updated PassPass for Windows 8.1 32&64-bit.
The download is in the 'List of tested Payload Files' page here.
PassPass allows you to log in to a system's user account without needing to know the password of the user. It works by permanently patching the code in a Windows DLL file. You can restore the file or unpatch it afterwards.
Recommended for Easy2Boot (fastest!) - SanDisk Extreme SDCZ880-128G-G46
BitCoin also accepted.