How do I install Roon Server 1.8 on Linux

I’m moving to a Linux roon server in the hope of ironing out some recent issues on an old-ish macbook.

I’ve installed Server 2.0 no problem on Ubuntu but want to install 1.8 to maintain compatibility with other devices. My server is running on an Macbook i7 x86_64.

Where would I find the installer for RoonServer 1.8 on Ubuntu?

You can find it here:

Thanks @BlackJack