i tried : chmod +x itch-setup && ./itch-setup

and it answers : bash: ./itch-setup : impossible d'exécuter le fichier binaire : Erreur de format pour exec()

well yes i'm french, is it because itchio app only work with 64bits os, or is it that i'm an infortunate ?

We no longer support 32 bit Linux with the most recent version of the app, sorry!

An older version can be found here: https://itchio.itch.io/itch

But, we do not support it any longer, and it will not receive any security updates so use at your own risk.

No need to be forced to upgrade your computer by such useless software anyway, just download the games themselves.