ATEM control software required?

I downloaded the ATEM OSX SDK and tried to run one of the sample binaries, DeviceInfo. It responds with

A Switcher Discovery instance could not be created. The Switcher drivers may not be installed.

I do not have an ATEM on the network and did not expect to get very far but am concerned that this means that I will not be able to make a standalone application but will need ATEM control software on the machine. Or are the drivers a part of the SDK I need to install?

You only need to install the ATEM Software Control application for the API to be properly registered. No need to really download the SDK to get the samples to run. Even the SDK manual is included in the desktop software install.

I don't have the ATEM Software Control application on my mac. Sounds like it is a requirement to have it installed. Also, I have used your EDL program on a PC that did have the software and it worked great for me - thanks.