Ola Dan,
Minimal system: Macintosh: OS 10.6.X or newer, Intel processor, 1GB RAM, 32-bit 3D Graphics card with at least 256MB of memory, USB Port Its compatible with 10.13.X, probably is giving a problem with the new OS Gatekeeper security system, please, install TeamViewer.com, then, msg me in private, I will control remotely your machine and fix the problem, a few minutes :)
Thanks
Tom