Installing msga on macOS

On first launch macOS says “msga” can’t be opened because Apple cannot check it for malicious software. That is expected: msga is not notarized by Apple yet, so macOS asks you to confirm the app once by hand. Here is the whole install, start to finish.

Install

Double-click msga-macos-arm64.dmg in Downloads. It mounts — a Finder window opens showing two icons: msga (the app) and an Applications folder shortcut.
Drag the msga icon onto the Applications shortcut in that same window. This copies the app to your Mac’s Applications.
Eject the disk image: click the ⏏ next to msga in the Finder sidebar. The .dmg file in Downloads can then be deleted.
Launch msga from Applications (Finder → Applications, or Spotlight), not from the mounted image — that is what the dialog’s “This item is on the disk image…” line means. Dismiss the dialog.
Go to System Settings → Privacy & Security and scroll to the bottom: a line says msga was blocked, with an Open Anyway button. Click it, authenticate, and confirm Open Anyway again in the dialog that follows.
If that button isn’t there, run in Terminal:
```
xattr -dr com.apple.quarantine /Applications/msga.app
```
then open msga from Applications again.

You only do this once. After that msga opens normally, like any other app.

Why macOS asks

Apple’s notarization requires a paid Apple Developer account. msga is free and open source, and its macOS builds are currently signed without one, so Gatekeeper cannot look up a notarization ticket and asks you to approve the app yourself. The source for every release is on GitHub, and you are welcome to build it yourself instead.

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