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macOS: 555_…_universal.dmg (Apple Silicon and Intel). The app isn't signed by Apple: on first launch, right-click 555 → “Open”, or run xattr -cr /Applications/555.app.
Windows: 555_…_x64-setup.exe. If Windows says “Windows protected your PC”: “More info” → “Run anyway”.
Android (8 or later): 555_…_android.apk. Open it on the phone and allow your browser or file manager to install apps. 555 isn't on the Play Store, so Play Protect may warn you: “More details” → “Install anyway”. To update, install the new APK over the old one.
Once installed, 555 updates itself.