Solution : https://service.sap.com/sap/support/notes/1086067 (SAP Service marketplace login required)
Key words :
user defined archive extensions, installer fails atphase deploy_online, upgrading db2-based kmc, db2-based kmc, sca/sda extensions, changing field widths, decreasing field widths, easier file handling, options -> settings -> viewer, message 'table kmc_urimapper
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