How to install the RegistrationQA extension

I installed RegistrationQA to calculate ICE, Jacobian, and I want to. But there are a few things I don’t understand.

↑I did the operation of the red line in the work of II.2, but this is not enough to just download the file. Isn’t it?

↑In II.3, I’m going to use cMake apart from 3DSlicer, but cMake What should I write in the sections “Where is the source code?” and “Where to build the binaries” I don’t know.

I am having trouble resolving these issues. Please reply to me.