I wasn't going to mention this due to the limitations of it for most general consumers without coding expertise, but I guess its worth a go If you've got a spare machine (and maybe a broadband connection with unlimited data allowance) or room for yet another VM.

The Windows 8 RTM final 90 day Evaution build can be acquired by anyone to use. However don't use this if you're looking for a permanent Windows 8 OS to fully activate after the 90 trial period. After the trial period is over it will 

!!!MAKE YOUR COMPUTER EXPLODE!!!... no, not really... 

...keep shutting down without giving you the ability to save and without warning. You will have to upgrade to the full version. Basically its as the name suggest so don't run it for main rig use. 

Click this to get to the official Windows 8 RTM 90 evaluation enterprise build in either 32 or 64 bit flavors. You need to scroll down to the bottom of the page.