Replace these 6 files in your Assets/CelShaderFX/ folder with the versions attached:

Hotfix.zip

After Unity recompiles, run CelShaderFX → Unity 6 → Enable URP Compatibility Mode from the top menu bar (one click). The effect will render in Game view immediately.

If you're on Unity 2021.3 or 2022.3, the replaced files behave identically to what you had , the Unity 6 changes are compile-time-gated and have zero runtime impact on older Unity versions. Drop them in safely.

This hotfix will also be in the upcoming v2.0 release in a cleaner form (full RenderGraph migration). For v1.0 who hit Unity 6 compatibility issues before v2.0 ships, these patch files are a self-contained drop-in fix.

What you need to do:

1. Download/receive the 6 patched files (you can zip the folder or send individually).
2. Overwrite the same-named files in their Assets/CelShaderFX/ folder.
3. Wait for Unity to recompile (a few seconds).
4. If on Unity 6: run CelShaderFX → Unity 6 → Enable URP Compatibility Mode from the top menu bar. This is a one-click toggle.
5. Enter Play , effect should render in Game view.