OK - probably me then. I searched for North St Helens in the repository and found a few versions - but copying one into my mods folder means I can now carry on following the guide
Computer:
System:
Host: arch-anywhereLounge Kernel: 5.2.11-arch1-1-ARCH x86_64 bits: 64
Desktop: Xfce 4.14.1 Distro: Arch Linux
Graphics;GTX1030; 12Gb Ram;CPU: Pentium G3528
I was trying to follow the beginners guide - but I only see "Simple Test Terrain" and STT Water - no other options...