All - is there a better (?define!) alternative to Apache for PC-based (ie non-server based) CGI testing of perl scripts?

There are a lot of webservers designed to be "small" or "tiny" that can execute CGIs with no or almost no configuration: Busybox bundles a CGI-capable webserver, thttpd can do CGI when enabled (RTFM), mini_httpd can do CGI, tinyhttpd can do CGI. And a little bit of searching will pop up tons of other little webservers.

but since I have installed Window 10

Well, don't use Windows ... *SCNR*

Try VirtualBox. Really. Setting up VirtualBox is just clicking through a standard installer. Download a Debian / Ubuntu / SuSE / Slackware / whatever-you-like setup ISO file, create a new virtual machine in VirtualBox, and install Linux from a virtual CDROM with the ISO file. Set network to bridge mode to make the VM appear in your network as an independant computer.

Or, use XAMPP for Windows. I don't like it, and should not be used on production machines, but it quickly gives you a working Apache installation, including PHP, Perl, MySQL (MariaDB), Tomcat, an FTP server, a mail server and a lot of other stuff. If you only want a working Apache, choose custom installation and remove anything but Apache.

Alexander