On Arch Linux, there are two types of Blender installation: One that uses the system's Python installation and one that uses a built-in Python installation. You can tell the difference using Blender Python Console window: built-in Python version is 3.11, system Python version is 3.13.
The VI-Suite, on Linux, only currently works when Blender is using the system's Python installation.
The Blender-bin installations from the AUR use their own built-in Python installation so won't work. You want Blender from the main repository (currently version 4.3.2) as this is the one that uses the system's Python installation. VI-Suite beta6 works with 4.3.2 as far as I can tell.
Some packages from the AUR are also required:
You will also need openfoam-org installation from the AUR for CFD.
On Windows 11, Blender always uses a built-in Python installation but the VI-Suite works with the built-in Python on Windows. So you only need to activate the VI-Suite addon and all Python libraries are installed for you. You just need OpenFOAM running via Docker Desktop as described in the user manual. Hope this helps!
Ryan