hi,
i was proposing this solution, but maybe there are better option. but if we use wxwebupdate (wxwidgets application c++) we need to compile it for all pd-extended platform (debian, ubuntu, mac intel / powerpc). if we don't need to modify this application, the windows version is working (at least on xp).
http://sourceforge.net/projects/wxcode/files/Components/WebUpdate/webupdate-...
if anyone is aware of an application for updating a software, cross-platform and open source, speak up.
pat