There is an ongoing outage on the primary CPAN mirror. It is possible to work around the issue by using MetaCPAN as a mirror.
To install Sort::ByExample, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Sort::ByExample
CPAN shell
perl -MCPAN -e shell install Sort::ByExample
For more information on module installation, please visit the detailed CPAN module installation guide.