Download the scaffold.zip file only. Unzip the contents and copy into the root of your c:\ drive.
For now, there's no installer, and everything is hardcoded to use:
c:\scaffold\bin\scaffold.exe -- this is the app you need to run. Add this directory to your PATH to run from anywhere.
c:\scaffold\templates\ -- this is where all the templates are. You can change them using Notepad.
c:\scaffold\output\ -- this is where your newly scaffolded modules will be created. When complete, copy to your learn-pr working directory.