Solution : https://service.sap.com/sap/support/notes/198589 (SAP Service marketplace login required)
Key words : 
64 bit    32 bit  upgrinf <sid> be_64 fe_32  64 bit    64 bit  upgrinf <sid> be_64 fe_64it, script upgrinf   32 bit    32 bit  upgrinf <sid>, \usr\sap\put\tmponly decif problems occur, /usr/sap/<sid>/sys/exe/runand, /usr/ccs/bin /usr/ucb $path, $path /usr/ccs/bin /usr/ucb, car -xvf <drive>\nt\<platform>\pretool3, <mountpoint>/unix/<operating_system>/sapdba orunder nt, car -xvf <mountpoint>/unix/<platform>/pretools, 30\ hkey_local_machine\software\informix\online\<dbserver>\change
Related Notes : 
       
| 390062 | Additional information about upgrading to 4.6C SR2 | 
| 338276 | Additional information: Upgrade to BW 2.1C | 
| 329622 | Additions: Upgrading to Basis 4.6C SR1 (NDI upgrade) | 
| 327285 | Additions to upgrade to 4.6C SR1 | 
| 304597 | Additions to upgrade to Release 4.6C FCS | 
| 300477 | |
| 213865 | Additions to upgrade to BW 2.0B | 
| 208975 | Additions to upgrade on Basis of 4.6C (NDI upgrade) | 
| 192949 | Additional info for upgrade to 4.6C | 
| 115619 | Informix Client versions | 
| 111876 | Installation of a 64 bit Informix Dynamic server |