Im running on Windows 8 with no issues.
You mentioned Windows 8 RT - if that was in reference to your own version that you have that means you probably have an Arm derivative ultrabook/tablet here we are talking ? Windows 8 RT is not Windows 8 .... RT is a butchered version designed for use on their ultrabooks etc.
Windows 8 is needed to support Windows x86 software
Windows 8 RT is not compatbile with Windows 8 (it says it right there on the box too! and the microsoft website). RT is not the same code as 'normal' windows, so obviously, drivers aren't compatible. Nor is the likes of 99% of your other software packages.
So - Have you got Windows 8 RT - which is NOT the same as 'Windows 8' ? If you have RT - you're kinda up a creek without a paddle.. and its not Solidoodles fault at all that you have an incompatible computer. They state Windows 8 support (which works fine - I'm using it right now with a print going).
If you have normal Windows 8 - all you need to do is go into Settings, General, Advance Startup. Reboot and when the menu appears, boot with "Driver Signing Disabled". When booted, install the drivers, and then reboot. Windows 8 Driver Signing is a Microsoft issue, not a 3rd party driver issue. Its to 'protect your safety'... or just make it a pain in the ass to install drivers 
So yeah - If its Windows 8 - try what I just described - worked fine on numerous setups I've done on Win8...
If you have Win8 RT - you out of luck 