Please, be aware that CVS versions should be considered as early beta.
If you'd like to install current CVS version of ptkdb you have to check out the source through anonymous CVS with the following instruction set.
cvs -d:pserver:firstname.lastname@example.org:/cvsroot/ptkdb login
(When prompted for password just hit ENTER/RETURN key, i.e. empty password)
cvs -z3 -d:pserver:email@example.com:/cvsroot/ptkdb co -P Devel-ptkdb
copy ptkdb.pm in C:\perl\site\lib\Devel\ptkdb.pm
Assuming that your Perl installation is on drive C:
copy ptkdb.pm in /usr/lib/perl5/5.x.x/Devel/ptkdb.pm
where 5.x.x is your current version of Perl.
You may also try web-based CVS repository viewer.