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 DNS::Zone::Struct::Common, copy and paste the appropriate command in to your terminal.
cpanm
cpanm DNS::Zone::Struct::Common
CPAN shell
perl -MCPAN -e shell install DNS::Zone::Struct::Common
For more information on module installation, please visit the detailed CPAN module installation guide.