Here is the honest story.

For nearly two decades, the Windows and macOS versions of GCompris functioned on a donation-ware model. While the source code was free, the pre-compiled binaries for these popular operating systems often came with only a subset of activities unlocked. Users were encouraged to purchase an "activation code" to access the full suite. This code served as a bridge between the developer's need for resources and the user's desire for comprehensive educational tools. Download - GCompris

This confuses many users. Here’s the breakdown:

GCompris is a high-quality educational software that provides a comprehensive learning experience for children. Developed by a team of experienced educators and software developers, GCompris offers over 100 activities that cater to various subjects, including mathematics, science, reading, and more. The software is designed to be engaging, interactive, and fun, making learning an enjoyable experience for kids.