Resolution:
As a rule the first two positions in of the version numbers must be the same.

For example:
Using TIBCO iProcess Workspace (Windows) 11.0.2 with TIBCO iProcess Engine 11.0.1 is supported.

However, using TIBCO iProcess Workspace (Windows) 11.0.2 with TIBCO iProcess Engine 10.6.1 is NOT supported.

Note.
There are some exceptions to this rule such as the 10.1 Windows Client which is supported against the 10.0 TIBCO iProcess Engine as there was no 10.1 TIBCO iProcess Engine.
Also, such products as Plug-ins, e.g. the TIBCO iProcess Decisions Server Plug-in is still at version 10.3 but is supported with TIBCO iProcess Engine 11.x.