Sparkle 2
A software update framework for macOS
... authentication for installing in secure locations. Support for sandboxing is currently under development. Requires no code in your app, but also provides deep delegate support for maximum customization. Developers can make Sparkle work exactly as they need, and users can make Sparkle work as they prefer. Your own branding, icons and app name are used - there's no mention of Sparkle. Works with any macOS app, whether it uses Cocoa, Qt, Xamarin, or otherwise.