To install Perl on a Windows computer without internet access, switch to Strawberry Perl, a free and open-source distribution available as an offline installer. Download the installer from their website, follow the instructions to install it, and start using Perl to write scripts and applications.
For installing Perl modules from CPAN, download the module’s tarball from the CPAN website, unpack it, configure the module using ‘perl Makefile.PL’, then build and install it with ‘make’ and ‘make install’ commands. Once installed, you can use the module in your Perl scripts and applications. Any other questions? Let me know!