Solution : https://service.sap.com/sap/support/notes/496976 (SAP Service marketplace login required)
Key words : 
sap business explorer browser browser bex generates cpic 020, /swcenter-mainthe sap download area appears, bw front-end check tool sapbexc, 0a/binary patches/sap gui windows, ftp downloading bw front-end patches, procedure downloading bw front-end patches, sap business explorer web application designer, \program files\common files\sap\system, sap business explorer analyzer customizing, downloading bw front-end patches
Related Notes : 
       
| 526438 | Internal error with communication with the IGS | 
| 512272 | BEx Browser generates CPIC 020, SAP 223 entries | 
| 510494 | Restricted key figures are not displayed in query definition | 
| 496977 | BW 3.0A front-end patch 8 | 
| 452322 | Customizing of the progress bar in BEx Analyzer | 
| 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 |