It's a security check by macOS and because Minion is not a known executable file my Apple's data it protects you from starting it.
But as it os not malicious you can still make it start. You need to allow the file in your Mac's security center (or whatever that is called on MacOS).
If you search for the error message without the Minion connection you will find help e.g. like this link "How to Fix "App Is Damaged and Can't Be Opened" on Mac":
https://www.howtogeek.com/803598/app...ant-be-opened/
The link also exlpains below the headline "Why Does This Happen?" why you see that messages on MacOS