To install dnsupdate:

cd install
sh install.sh

No questions will be asked! The install script is just i first test.

Then, check dnsupdaterc.sample and read the man pages 
man dnsupdate 
man dnsupdaterc



The files installed are
/usr/bin/dnsupdate
/usr/share/man1/dnsupdate.1.gz
/usr/share/man5/dnsupdterc.5.gz

If you do not have the dnspython modules installed they will be installed
in python site-packages.