The Parser object is no longer part of Mason. It has been replaced by the Compiler and Lexer objects. See the Developer's Manual (HTML::Mason::Devel) and Admin Guide (HTML::Mason::Admin) for more details.
To install HTML::Mason, copy and paste the appropriate command in to your terminal.
cpanm
cpanm HTML::Mason
CPAN shell
perl -MCPAN -e shell install HTML::Mason
For more information on module installation, please visit the detailed CPAN module installation guide.