Click is provided as a managed solution for Microsoft Dynamics 2013, 2015, 2016 and Dynamics 365. This means that Dynamics is responsible for the processes of installing and uninstalling the solution and its components.
Before uninstalling Click from your Dynamics environment, 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 a Dynamics environment after a solution is installed. In order to remove the solution, you must first remove the solution's dependencies.
CRM 2016/Dynamics 365
Please review Microsoft's documentation on deleting a solution from Dynamics 365.