Win32::SerialPort has not seen a release since 2010. This bug is becoming a serious issue for me, I just cannot distribute my Perl script smoothly:

Change the way you distribute your script (distribute your fork of this module)?

Also fork it now and upload the fork on the internet (cpan/whatever), direct your users to use your fork, report your fork to the maintainer (its a patch) and move on with your life

Also see old wisdom Re: Device::Modem Find which Port Modem is connected to