Go to the "Help" menu and select "Enter License Key" .

The 5.4.1 key is specifically for that version. If you have updated to a newer major version (e.g., 6.x), a 5.4.1 key will not work.

In the world of industrial automation, software development, and legacy system maintenance, the need to emulate hardware interfaces is common. by FabulaTech is a premier solution designed to create virtual COM ports and connect them via a virtual null-modem cable 1.