Solution : https://service.sap.com/sap/support/notes/496984 (SAP Service marketplace login required)
Key words : 
/swcenter-mainthe sap download area appears, unlike subsequent bw front-end patches, bw front end check tool sapbexc, procedure downloading bw front-end patches, \program files\common files\sap\system, install bw front-end patches distributing, sap business explorer web application designer, 0b/binary patches/sap gui, install bw front-end patches, bw front-end patch corrects
Related Notes : 
       
| 742553 | Installing BW 3.xX front-end patches | 
| 653950 | BW 3.xX Front-End Patch 11 | 
| 558914 | BW 3.1C: Dates for front-end patches | 
| 526438 | Internal error with communication with the IGS | 
| 396452 | Server-based BW Frontend check | 
| 361222 | SapPatch: Importing GUI Patches | 
| 197460 | BW Frontend Checktool sapbexc.xla | 
| 142705 | Files for the BW support | 
| 96885 | Downloading front end patches |