Online search for "macOS cannot verify that this app is free from malware" showed me this:
https://macresearch.org/macos-cannot...-from-malware/
There is a description in the text beginning at the bottom
"How to override the “macOS cannot verify that this app is free from malware” warning – Guide"
Seems to happen as the app Minion is not released on the apple store. Stupid behaviour of Apple to force developers to use the Apple store and pay Apple their x% by this. All behind the wording "malware protection", right....
Even if this might be a good solution to check apps for virus etc. But you can be sure that Minion is no virus or malware
How to override the “macOS cannot verify that this app is free from malware” warning – Guide
Only follow the next steps if you are a hundred percent certain that the app you are trying to install is safe:
Open Finder and find the application that gives you the “macOS cannot verify that this app is free from malware” warning message.
Control-Click on the application.
Access the shortcut menu and click Open. After you do this, the app will be whitelisted and you will be able to open it from now on without getting the “macOS cannot verify that this app is free from malware” warning.
Another way to whitelist an app is to click the Open Anyway available in Security & Privacy Preferences. Note that this button would only be available for an hour after you try to open a blocked app. To reach this button, open the Apple Menu, go to System Preferences, click on Security & Privacy, and select General.
This short guide should help you install and freely use apps that are not trusted by Apple because they are not in the App Store but, as we said, you should be careful with such apps and only run them if you are certain that they are not dangerous.
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Hope this is still valid and helps, as you have not told us your OSX version you are using.