Different ways to install vyos

how to install vyos not just through ISO file or pxe?

There’s a ton of options, all documented here: Installation and Image Management — VyOS 1.4.x (sagitta) documentation

That’s a pretty generic request. What platform are you trying to install on?

how install vyos automatically?

is there an arm64 platform solution?

I don’t think there is a way to implement that at all. But it only takes about 30 seconds to install.

I don’t see one available for download, so…no?

VyOS is only for AMD64. As much as it would be cool to have an ARM / ARM64 version. I haven’t looked for a long while now, but a lot of the original supporting packages for VyOS (at the time Vyatta) didnt support anything else except the x86 architecture

You can PXE boot an ISO image. As an example –
https://oitibs.com/pxe-boot-almost-any-iso-image/