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macOS, Apple chip only: ColdOpen-0.1.0-alpha.3-macos-arm64.dmg, 6.3 MB.
If it doesn't start in a moment, download it here.
Next: install it
- Open the disk image and drag Cold Open to Applications.
- The first time you open it, macOS refuses, because it isn't notarized yet. Open System Settings ▸ Privacy & Security and click Open Anyway.
The full steps are in Install, with how to check the file against its checksum.