Unfortunately, I do believe this application has been retired. There are several freeware alternatives and little interest in it as a paid application.
I so wish I had read this before wasting the past 90 minutes trying to install it. I had been using Dexpot, which takes a s...load of configuring but eventually works quite well. Unfortunately it doesn't play well with Fences, restricting it to the 1st desktop. Double clicking on any of the virtual desktops to unhide Fences does nothing, reducing the usefulness of the extra desktops by half.
I've only just gone back to MS as my main OS (Win7 Ultimate X64) after years of being a committed Linux user. Win7 is the best desktop OS produced so far by MS, but why oh why will they never include multiple desktops, a great productivity aid and one of the top 5 attractions (IMO) of Linux.
Shirley, if the application has been discontinued, can you please try and get the appropriate web pages updated? I very nearly bought it without trialling it first, expecting it to run as well as Fences which installed on X64 with no problems.
Or on another tack, if Stardock don't wish to maintain or update Virtual Desktops, it would be good public relations if they were to release the source code under an open source license and let volunteer developers play with it and see what comes of it.