To install DBIx::Class::Helper::ResultSet::WindowFunctions, copy and paste the appropriate command in to your terminal.

cpanm

cpanm DBIx::Class::Helper::ResultSet::WindowFunctions

CPAN shell

perl -MCPAN -e shell
install DBIx::Class::Helper::ResultSet::WindowFunctions

For more information on module installation, please visit the detailed CPAN module installation guide.