Let me ask a more precise question. Zope is not released under GPL. Joe repleases a component which can be used with Zope under GPL license. Zope.org makes it available for download, but in no way incorporates it into their base system. (I.e., it is available for integration by an end user). Joan uses Zope with Joe's component (Product in Zope parlance). She writes something that depends on Joe's product being present, but makes no modification to Joe's product. She does not wish to GPL her work. Can she give directions on how to acquire Joe's product and install it preliminary to installing her own work? Can she distribute Zope, Joe's product, and her own product, as long as they are packaged separately? Can she write an installer that fetches Joe's Product and installs it before installing her own work?