Hi kittybee, there's another version in the Downloads called 'Pixel_Fireplace_64bitBeta_v0_9_1.zip' that will work on macOS Catalina. It's a Beta version but it has the essential features and commands. You can find some more info on that version here: https://hammertail.itch.io/pixel-fireplace/devlog/116290/macos-64-bit-beta-v091