Hmmmm... not sure if I have any advice. I just downloaded all three of the wizards and installed them without any problems. I saved them to a "downloads" folder, and then imported them from Storm (prior to building a studio) using the "Import Wizards" command from File > Import a Wizard. The Electropop wizard seemed to hang a bit in the importing, but other than that, there doesn't seem to be a problem.
I didn't put them in the Storm Wizards folder first.
I'm running my Powerbook 1GHz with OS X (Jag, latest build) - don't know if that would cause any appreciable difference.