Solution : https://service.sap.com/sap/support/notes/449159 (SAP Service marketplace login required)
Key words : 
su - root  cd /informix/<sapsid>  setenv informixdir /informix/<sapsid> note, start -> programs -> informix connect -> uninstallor  start -> programs -> informix -> uninstall, car -xvf <cd mountdir>/unix/<os version>/inf_fe, \nt\i386\informix\iconnect\icon723\disk1\setup, informix connect runtime files  additional gls files 6, su - root cd /informix/<sapsid> pkgadd -, \nt\i386\informix\iconnect\disk1\setup, cd <cd mountdir>/unix/common/dbtools, \nt\i386\informix\iconnect\<iconversion>\setup, <cd drive>\nt\alpha\informix\install
Related Notes : 
       
| 379231 | Informix client versions | 
| 115619 | Informix Client versions |