How to know if perl module is installed and its version
Run in your command line:
perldoc -l LWP::UserAgent
/usr/local/share/perl5/LWP/UserAgent.pm
perl -e 'foreach (@INC) { print `find $_ -type f -name "*.pm"`; }' |grep UserAgent
/usr/local/share/perl5/LWP/UserAgent.pm
/usr/share/perl5/CPAN/LWP/UserAgent.pm
./.cpanm/work/1589816008.10374/CPAN-2.27/blib/lib/CPAN/LWP/UserAgent.pm
./.cpanm/work/1589816008.10374/CPAN-2.27/lib/CPAN/LWP/UserAgent.pm
cpan -i LWP::UserAgent
… Read the restReading ‘/home/.cpan/Metadata’
Database was generated on Fri, 10 Apr 2020 20:29:02 GMT
CPAN: Module::CoreList loaded ok (v2.76_02)
LWP::UserAgent is up to date (6.46).