problem installing sparks from command line

[eluser]bulmer[/eluser]
Although I can install the various Sparks I use manually, I would much prefer to install them by the Command Line. However when I try all I get is an empty folder structure for the Spark. I am running CI on a Local Development Server (Uniform Server) on a Win 7 laptop. I emailed getsparks.org but received no reply.
Anyone had a similar experience here? Cheers.