Solution : https://service.sap.com/sap/support/notes/496990 (SAP Service marketplace login required)
Key words : 
/swcenter-mainthe sap download area appears, bw front-end check tool sapbexc, 0b front end requires sap gui 6, \program files\common files\sap\system, procedure downloading bw front-end patches, sap business explorer web application designer, sap business explorer browser termination, download bw front-end patches, bw front-end patch include, bw front-end patch corrects
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