Every script will be working with or without the headset, you can even use scripts without the videos, but for VR it’s recommended to have one. VR videos are similar to the flat videos, but you can look around for better immersion, kinda like Google Street View.
I know you can use Whirlgig with mouse to watch VR videos on Windows PC/laptop without the headset but the image will be a little distorted. I don’t think there is a way to watch VR videos on Mac without the headset but maybe there was someone with similar question earlier, you can try checking in the Help section.
I would look here to see how to connect Keon to your Mac: