Official releases can be downloaded from GitHub: https://github.com/arno-iptables-firewall/aif/releases

Old(er) versions: Old version directory

Plugins (GIT): Plugin directory

Distributions that have included AIF:
Debian - Debian main repository
Ubuntu - Ubuntu universe repository
Arch Linux - Link
Ast Linux - Link

If you want to become a maintainer for other distributions, please contact me (and I'll add a link here).