On Windows 8, if you run the file named "setup" it will fail. This is to be expected. When the setup fails, Windows 8 should "popup" a window asking you if you want to run it in compatability mode. If you select this, it will rerun the setup and setup will succeed with a window popping up that asks if it indeed suceeded. Select yet. Now windows is at least partially aware of Zoom R*. That said, I can't figure out how to get it to control my DAW (Studio One 2). This might be because of ignorance as I just got the my R8, but it might be that it just doesn't work under Windows 8.
Microsoft allows one to download a compatibility tool at their site to buy Windows 8. When I run the checker with my R8 on, windows list the R8 as one of the many pieces of software the SHOULD work. Meanwhile the Device Manager thinks no driver is installed.
From my list of compatible software as provided by the Windows 8 Upgade Assistant:
Realtek PCIe GBE Family Controller
ZOOM R8 Audio Interface
I will update this if I can successfully use the device as a controller for either Cubase 6 LE (?) that came with the device or my preferred DAW. I hope Zoom provides a "regular" driver soon. I don't want to keep my other activities at bay because I can't upgrade confidently.
I don't like reading manuals... I was able to setup up the my DAW (PreSonus Studio One 2) with the R8 as both an audio contoller and audio interface after following the steps I outlined before and selecting a Mackie Control style option as describe in @ http://www.zoom.co.jp/faq/r8
I have project I want to record in a few days and I will let y'all know my experience with Windows 8 and the current drivers.
Worked perfectly using Studio One 2 with the device setup as Mackie Control.