The tool is built in Godot 4.5 using the Compatibility renderer, which is designed to support macOS 10.13 and later, including 10.13.6. I haven’t personally tested the tool on that exact version, so I can’t make a 100% guarantee, but we haven’t included any features that should break compatibility. The tool doesn’t rely on advanced shaders or GPU-heavy effects, so it should run fine as long as your system supports basic OpenGL 3.3. That said, if you try it and run into any issues on 10.13.6, Itch.io can provide a refund through their support system, no problem.