amd64 and arm64 architectures are available on the Talos releases page.
When booted from an ISO, Talos does not install itself to disk until a machine configuration is applied.
For steps on how to install Talos, follow the getting started guide.
If a Talos installation already exists on the disk, the machine will boot into that installation even when booting from a Talos ISO. The boot order should prefer disk over ISO, or the ISO should be removed after installation to ensure Talos boots from disk.
metal-<arch>.isosupports booting on BIOS and UEFI systems (UEFI only for arm64)metal-<arch>-secureboot.isosupports booting on UEFI systems in SecureBoot mode only (via Image Factory)