Click on iCompta.ipa and rename it iCompta.zip --> OK
Double click on it to expand, it will create a folder named iCompta --> OK
Open that folder and go in the Payload folder --> OK
Replace iCompta.app with the one you downloaded above --> I replaced the icompta file from payload folder with the
downloaded one!
Go back to iTunes/Mobile Applications folder --> OK
Move iCompta.zip to the trash --> OK
Right click on iCompta folder and click on compress menu item --> OK
Rename iCompta.zip to iCompta.ipa --> OK
Try to sync --> itunes say: it is not a valid app!
