On macOS High Sierra, the installation of kernel extensions requires user approval. It is necessary to install a kernel extension for My Fabulous Storyteller to communicate with your computer.
This new authorization system has induced some changes in the Luniistore installation interface, now less intuitive. The short video below is a step-by-step guide on how to install the software on your Mac (it was recorded on the French version of macOS but the steps will be the same).