Thanks for your help and patience.
I think you are right that there is an issue with the install.
When I type bash GPIOnext/install.sh the following messages appear:
Err http://archive.raspberrypi.org jessie Release.gpy
Could not resolve 'archive.raspberrypi.org'
Err http://mirrordirector.raspbian.org jessie Release.gpy
Could not resolve 'mirrordirector.raspbian.org'
Reading package list begins
Then there are list of failure.
Not sure what I am doing wrong.