RenderMan for Blender Installation Instructions
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1.  Install Blender if not already (2.78 recommended)

2.  Register for the free Non-Commercial Version of RenderMan from Pixar.
https://renderman.pixar.com/store/intro

3.  Download and install RenderMan Pro Server Package and 
installation instructions at: http://rendermansite.pixar.com/view/get-renderman 
You need to install at a minimum RenderMan Pro Server 21.0
It is recommended to install RenderMan Pro Server in the default location (or see advanced instructions below)

3.A If on Windows, be sure to restart after installing RenderMan Pro Server

4.  Download the latest release of the RenderMan for Blender addon 
https://github.com/prman-pixar/RenderManForBlender/releases save the zip file somewhere.

5.  Start Blender, and from the File->User Preferences->Add-ons install the zip file from step 4.  

6.  Change your renderer to RenderMan and start rendering!


ADVANCED:
RenderMan normally bases everything off a variable RMANTREE which is set to your installation
folder, eg /Applications/Pixar/RenderManProServer-21.0 on OSX and C:\Program Files\Pixar\RenderManProServer-21.0 on Windows.

RenderMan for Blender will try and guess the appropriate RenderMan version to use and the location of
the RMANTREE folder.  If you are installing RenderMan to the standard location you shouldn't have to do anything!

However, if you installed in a non-standard location, set the RMANTREE 
environment variable before starting blender.

Furthermore, advanced options for finding the RenderMan Pro Server location 
are in the addon preferences.