There was a download of MegunoLink 1.37.23246.903 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The MegunoLink installer is commonly called MegunoLink.exe or MegunoLinkPro.exe etc.
This free tool was originally developed by Blue Leaf Software Limited. We recommend checking the downloaded files with any free antivirus. This PC program works fine with 32-bit versions of Windows XP/Vista/7/8/10/11. The most popular version of the program 1.0. MegunoLink is included in System Utilities.
From the developer:
MegunoLink is a free tool for talking to Arduino microcontrollers (or any serial device for that matter). Whether you work with the Arduino development environment or another tool, MegunoLink can graph data sent from the Arduino to your PC, log serial data to a text-file or a monitor window, and can simulate serial protocols for missing devices.
You may want to check out more software, such as ThinkPad-Konfiguration, Schmap or Hercules DualPix Exchange Webcam, which might be related to MegunoLink.