Hello mdmisch,
It depends.
Wich GNU/Linux distro do you want use to run Jami ?
Downloads from jami.net still available for Ubuntu 18.04 LTS in 32 bits or i386/i486/i686 architecture. Here https://dl.jami.net/ring-manual/ubuntu_18.04/jami-all_i386.deb or here https://jami.net/download-jami-linux/#open-modal-ubuntu-18.04-32-bit. There are also builds for Linux Mint 19 and ZorinOS 15.
If you want use an other distro, you can install Jami via the guix package manager on your current GNU/Linux distro Jami sur Guix (gestionnaire de paquet) - #18 by apteryx. I can’t advice Jami Snapcraft or Flatpack i386 builds, too olds for the moment.