Read original post at Mike Taulty's Blog
Unless you’ve been hiding under a rock, you’ll know that Windows 8 has RTM’d and is available for download via MSDN.
If you’re not an MSDN subscriber but you have been using Windows 8 to develop applications then you might well want to continue to do that on an RTM version of the OS and you can do that if you go and download the evaluation copy: Windows 8 Evaluation Copy for Developers.