Solution : https://service.sap.com/sap/support/notes/504959 (SAP Service marketplace login required)
Key words : 
general/r3server/abap/note, car   car -xf ua620for610, sapcar -xf gdos390, sapcar -xf gdunix, -default source code, separate property file, car -xf ua620for46x, downloaded car file, html upgrade guide, terms upgrade assistant
Related Notes : 
       
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| 306428 | Downloading the upgrade guide in PlainHtml format | 
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