The Mail::POP3Client module is not part of the standard
module set, so you have to get it from somewhere. Most
modules are on CPAN.
So:
> I dloaded...
was sort of the right step.
But you also need to install it (usually just means putting
it in the right location).
Certainly:
> renamed it to POP3Client.pl
wasn't the right thing to do.
As it happens, doing a manual download wasn't
really the right thing to do either, because there
are tools that do everything for you (find the right
module, download it, install it).
If you are using ActiveState perl on Windows, use
their system (I think it's called ppm). Otherwise,
use cpan by typing, at the command prompt:
cpan
Then, to install Mail::POP3Client, enter
install Mail::POP3Client
and it should all happen right.
To prove the module installed right, quit cpan
(q) and then enter:
perl -e 'use Mail::POP3Client'