For use with a forked driver...

[SavageTheUnicorn]

I see that in the repo, the application targets "IddSampleDriver Device" in the device manager which is spectacular for the normal IddSampleDriver, but it will not work for forked drivers that have been renamed. An example of such is the fork which allows high refresh rates; https://github.com/itsmikethetech/Virtual-Display-Driver
His driver is named "Virtual Display Driver by MTT" so this project wont work with it unless it's manually edited and built from the provided source code.

As an idea, could you add an option somewhere to change the target device, or build one that targets that device name instead? I am unaware of any other way to solve this.

[SavageTheUnicorn]

I would try to build it myself but I have no prior experience with C#. The most I've tinkered with was Visual Studio, unsuccessfully might I add.

[ganzvu]

Just change the targeted string in Program.cs from "IddSampleDevice" to "IddSampleDevice HDR" and recompile it