Sorry for rare posting,
unfortunately I also could not get network part working, seems the TAP driver does not fit Win7, and then one installed from latest version of OpenVPN does not fit current OS image...

Just to share another finding:
OS-9 LV II and OS-9000 x86 images

There is a link (still working) to the Microware evaluation CD, (only for x86 tough) with Hawk development environment, unfortunately not checked yet and no idea, whether it might be useful somehow or not...