BSF Wikimedia content are partly not available anymore for download.
It seems for example impossible to get Wikinews in French installed.
I suspect that the ZIP file referenced in the catalog is simply not available anymore on http://download.kiwix.org.
One problem is that if a content is not available, the installation should fail!
An other one, is that the BSF catalog is outdated, so we should probably hurry up with generating our own catalog (based on the OPDS stream). This seems meanwhile a blocker for Pibox-installer 1.0 release.