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 URI::Find::UTF8::ExtraCharacters, copy and paste the appropriate command in to your terminal.
cpanm
cpanm URI::Find::UTF8::ExtraCharacters
CPAN shell
perl -MCPAN -e shell install URI::Find::UTF8::ExtraCharacters
For more information on module installation, please visit the detailed CPAN module installation guide.