There should be a CHANGELOG.txt file in the FluXY/ installation folder. It contains a register of all notable changes to FluXY over time in reverse chronological order (latest changes first). The version you have installed appears at the top of the file.
Assuming you have some basic 3D graphics knowledge (basic shading, vector algebra), FluXY is quite simple and straightforward to use.
Depends on what you want to do. For most eye-candy applications, not really. If you want to make something more complex, add user interaction, or tinker with fluid physics in realtime, then you will need some C# experience.
Yes. The entirety of the fluid simulation and rendering pipeline run 100% on the GPU.
FluXY will run in any platform compatible with shader model 3.0.
Yes, it does.
FluXY supports the built-in render pipeline, URP and HDRP.
Full C# and hlsl source code are included.