Download the latest release tarball (1.6):
See http://mirrorbrain.org/files/releases/ for all releases.
(Since 2015-06, the Subversion repository at http://svn.mirrorbrain.org/svn/mod_asn/trunk/ is obsolete.)
mod_asn binary packages are available from the same locations as the MirrorBrain binary packages; therefore, please look here: http://mirrorbrain.org/download/
Notes for packagers
mod_asn should be fairly trivial to package. You could look at the spec files in the Open Build Service here, for rough guidance (click on the 'files' tab).