To install Perl::Critic::Policy::CodeLayout::ProhibitSpaceIndentation, simply copy and paste either of the commands in to your terminal

cpanm

                    cpanm Perl::Critic::Policy::CodeLayout::ProhibitSpaceIndentation

CPAN shell

                    perl -MCPAN -e shell
                    install Perl::Critic::Policy::CodeLayout::ProhibitSpaceIndentation

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