Providing binaries outside the AppStore get trickier with every new macOS release.
Squeak bundles are signed, which enables you to open the .dmg but still requires and extra trick to confirm the start: - http://files.squeak.org/trunk/Squeak6.0alpha-21585-64bit/Squeak6.0alpha-2158...
Thus we will also notarize the release bundles so that it works out of the box.