which roxen 6.x as replacement for caudium?

hi,

which version of roxen (strictly opensource, no purchase needed) would
be the right one to replace an old caudium webserver? 
i dont want to/cannot use the version from roxen.com, as i would like
to have it on an appliance and the roxen.com-version seems to be
somewhat outdated. pike 8.0.702 is already running.

what is the correct path to install roxen with a given pike? 
if needed i could provide a installation-document after finding the
correct way to do so.

josef