Solution : https://service.sap.com/sap/support/notes/361222 (SAP Service marketplace login required)
Key words : 
menu 'tools' select 'apply patch', sapsetup terminates withan error message, \\<servername>\<sharename>\netinst\sapsetup, start configuration program   sapadmin, desired command line switch, start  \\<servername>\<sharename>\setup, existing installation root directory, local \sappc\netinst directory, start installation program sapsetup, >> tools -- apply patch
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