Is it even possible to install Spinnaker in an on premise RHEL box without internet connection?

Is it even possible to install Spinnaker in an on premise RHEL box without internet connection ???

I am using halyard and even with using --no validate in all the commands it failes in the apply command looking for versions.yaml file. So is my following statement correct:

We can't install Spinnaker in an on premise RHEL box without internet connection!!!!