It's OEM versions of WindowBlinds, IconPackager, and ThemeManager that require signed skins for use.
If you already have Object Desktop, just install ThemeManager, WB, and IP like normal. Run the AlienGUIse installer and the .suite's should be installed for use with ThemeManager.
The .suite's are renamed zip's, they have dirs with the icon packages, WindowBlinds visual style, and WMP skin inside them.