The latest versions of Samba are always on nimbus.anu.edu.au in
the directory pub/tridge/samba/.

You only need to download 1 file to get a complete copy of Samba. Look
for the file samba-latest.tar.gz. This is a soft link to the latest
version. You will need gunzip and tar to unpack the archive. 

This file includes all the documentation as well.