ClickDimensions is provided as a managed solution for Microsoft Dynamics CRM 2011, 2013, 2015, 2016 and Dynamics 365. This means that CRM is responsible for the processes of installing and uninstalling the solution and its components.
Before uninstalling ClickDimensions from your CRM, remember that uninstalling a managed solution will delete all the data stored in the solution's custom entities.
Deleting a solution
When deleting a solution, you may find that the solution has dependent components (dependencies) that prevent it from being removed. Dependencies can be created when customizing CRM after a solution is installed. In order to remove the solution, you must first remove the solution's dependencies.
CRM 2011
Please review Microsoft's documentation on deleting a solution from Dynamics 2011.
CRM 2016/Dynamics 365
Please review Microsoft's documentation on deleting a solution from Dynamics 365.