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Re:MonitorControl: Control external monitor brightness and v... by alin23 on Friday July 10, 2020 @07:14AM (#23790306)
Lunar is signed and notarized with a paid developer certificate so I don’t think gatekeeper could block it in anyway.

It’s possible that in High Sierra you are missing the Swift 5 runtime. You can find details about this in the troubleshooting section of the GitHub readme.

Here is the link where you can download an installer for that: https://support.apple.com/kb/DL1998?locale=en_US

Re:MonitorControl: Control external monitor brightness and v... by throwanem on Friday July 10, 2020 @11:08AM (#23792246)
That did the trick, thanks! Weird that the error details would talk about code signing when the problem was a missing runtime, but go figure.

I've switched over to using Lunar as of this morning, following the runtime install. Unfortunately, it looks like today's going to be cloudy straight through, so I don't know that I'll get the best opportunity to see the app strut its stuff right away. That said, the UX has been very solid thus far, and I like the extensive configurability even if I have no intention of using more than about 5% of it.

Strong recommend, and definitely worth a coffee!