Solution : https://service.sap.com/sap/support/notes/402961 (SAP Service marketplace login required)
Key words : 
//sapservx/general/frontend/patches/rel46d/windows/win32/description, //sapservx/general/frontend/patches/rel46d/windows/win32/, sapservx/general/frontend/patches/rel46d/windows/win32, menu option extras --> import patch4, installation additional key words patch, 0a delivers error messages, manually register ocx files, installation server      program sapadmin, manually unpacking patches, registrationdownward-compatible sem 3
Related Notes : 
       
| 396640 | Implementing SEM 3.0A Frontend patch | 
| 361222 | SapPatch: Importing GUI Patches | 
| 147519 | Maintenance strategy / deadlines for SAP GUI | 
| 96885 | Downloading front end patches |