I'm curious about something. Not being totally sure what you meant by "Virtual Clonedrive", I did a search and discovered it's basically taking an ISO (or similar) and mounting it as a virtual drive. That being the case, why do you guys bother to look for software that does this? If you wanted to do that with Windows 8.1 , simply right click the ISO and select "Mount". I've done it a few times before and it works great.
Then again you could simply extract the ISO's files and run the setup program.