Solution : https://service.sap.com/sap/support/notes/394786 (SAP Service marketplace login required)
Key words : 
/patches -> sap workplace ->  sap workplace 2, workplace support package level, support package number directly, 11 -> binary patches -> workplace 2, sap service marketplace, package ->  os independent, added version number, instance>\services\ directory, sp number 46dc3, latest installed version
Related Notes : 
       
| 619010 | WP2.11:Script Error while Logout | 
| 514958 | WP 2.11: workplac.car and ITS version | 
| 445925 | WP 2.11: Corrections in the session management |