Client cache upgrade is not supported for the Windchill Workgroup Manager. Each Windchill Workgroup Manager user must upload or check in all new or modified objects in all workspaces, shutdown Windchill Workgroup Manager, and remove the client cache before the Windchill upgrade. For more information, refer to the following article: https://www.ptc.com/appserver/cs/view/solution.jsp?n=CS46007