Genymotion virtualization engine not found/plugin loading aborted on Mac
You have to install Virtualbox to get genymotion to work.
Here is the link to download it https://www.virtualbox.org/wiki/Downloads
MacOS [High Sierra]10.13.4
Download Virtual Box 5.2.8 then tried to run Genymotion.
Download Genymotion 2.12 for personal use by signing up.
Restart the machine.
Change System Preferences at Security & Privacy the virtual box installation was being blocked. You can see than Oracle America..blah blah.. in General Tab. Just Allow it, you could see installation gets completed.
Now try to start Genymotion, it will install required plugins.
Start adding virtual devices.
Found this solution on another stackoverflow, but thought I'd help spread the good word. The problem has to do with VBoxManager installing to /usr/local/bin and genymotion expecting it in /usr/bin. So create a symlink and you're golden:
sudo ln -s /usr/local/bin/VBoxManage /usr/bin
It should also be noted that you should keep an eye on what version of VirtualBox is recommended by genymotion. Currently (as of July 31, 2017), it's 5.0.26.