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.