Unpack the zip into C:\usr\local. Io currently requires a hardcoded path to find the addons.
The vm builds completely cleanly with vc8 and cygwin make. The vm passes nearly all of the regression tests except for the unicode text suite.
This build doesn't include many of the addons which are optional anyway and not part of the core of Io. This isn't any indication as to the state the addons are in with respect to win32 and is more about the fact I don't have any time to look at them to get them to build.
The following addons now compile and are also included but none are tested by me, they are just the ones that happen to link without any work on my part:
This build is with vc8, release, linked against the multithreaded dynamic CRT. You can no longer use addons with the static CRT. I do not include the msvcrt80 runtime as you can download and install it from microsoft.com should you require it.
If you are interested in building io for yourself I've found using the makefiles with gnu make the easiest way. Something like:
% make CC=cl INSTALL_PREFIX installworks for me