Network install

My organisation are trying to use the network install of PsychoPy detailed here: http://www.psychopy.org/recipes/classroomInstallation.html

I am finding that step 5. is not accurate. To ensure the client uses the version stored on the network, I have to delete Psychopyxxx.egg in the Site Packages folder and then use Python to run import pyschopy.

As far as I can tell, I have followed the instructions to the letter. Can anyone advise?

Thanks