$ mversion pp
0.992

$ perldoc -l pp
C:\perl\site\lib\pp.pm

$ which -a pp
C:/perl/site/bin/pp
C:/perl/site/bin/pp.BAT

$ cpanm pp
pp is up to date. (0.992)

OTOH, I don't know why PAR doesn't make PAR::Packer a dependency -- so its circular dependency, all the cpan clients should know how to deal with this by now (not a new problem)