You can find packages for Fedora Core 4 on http://geany.uvena.de/ in the download section.
Binary packages for Debian are available at http://debian.uvena.de/.
You can add one of the following lines(depending on your system) to your apt
sources.list to get automatically get the latest version of
Geany:
deb http://debian.uvena.de/ ./stable/
deb http://debian.uvena.de/ ./testing/