Solution : https://service.sap.com/sap/support/notes/401595 (SAP Service marketplace login required)
Key words : 
additional key words sapscript, sapscript pc editor, pc editor solution, 6d gui patch, text editor, editor control, latest patch, 'backspace' button, prerequisites error, note 96885
Related Notes : 
       
| 96885 | Downloading front end patches |