Latest version of distsync is 2.0.2
Latest version of dsc2man is 1.0.0
You can download all files from here.
Untar and unzip the archive (i.e. "tar -xvzpf distsync.tar.gz") into a temporary location and run the "install.sh" shell script.
Using the "install.sh" script without any parameter will show a small help. To create a local mirror either first create an appropriate "distributions.list" file or use apt's "sources.list" file (see an official Debian mirror).
distsync and dsc2man are perl scripts (version 5.6) and should be usable on any stable Debian system. In case of uncertainness look for the use conditions inside the scripts.