Product:
Planning Analytics 2.0.4
Planning Analytics Workspace 2.0.4
Microsoft Windows 2016 Server

Issue:
When you run Start.bat under Windows 2016 to install PAW you get a error.

Error message:
ERROR: The system was unable to find the specified registry key or value.
Install Docker Toolbox for Windows and try again.

Possible Solution:
You have follow this instructions to install Docker for Windows 2016.
https://docs.docker.com/install/windows/docker-ee/#install-docker-ee
But you have downloaded the wrong PAW file that is for Windows 2012 and try to install that.
Here how setup Windows 2012 with docker
https://docs.docker.com/docker-for-windows/install/
If you have the correct PAW file for Windows 2016 you should start a powershell file called Start.ps1.
Download the correct file ipa_workspace_local_win_2.0.30.228.6.zip from below link
http://www-01.ibm.com/support/docview.wss?uid=swg27049597

and from a powershell prompt enter ./Start.ps1 to install PAW.