AV Linux is currently based on the stable Debian GNU/Linux 9 “Stretch” operating system series and features support for both 32-bit and 64-bit architectures, but AV Linux 2019.4.10 appears to be the last release with these features as the devs decided it’s time for a change. They announced that the next major release of AV Linux will be based on the upcoming Debian GNU/Linux 10 “Buster” (currently developed under the Debian Testing umbrella), and that it will drop support for 32-bit installations. However, most probably current 32-bit installations will still be supported.