By James Philip
The Revit 2017 Cobie Extension can be downloaded using the following link:
http://www.biminteroperabilitytools.com/cobieextension/#_
Fig 1
Once there you will see the page shown in Fig 1. You can now download the version you require.
The installation, setup and user instructions can be found on the help page, use the link below to access it.
http://www.biminteroperabilitytools.com/cobieextension/help/index.html
This will take you to the page shown in Fig 2. You can then choose your required option.
Fig 2