
You can click Open Anyway and take your chances. You’ll see a note about the denied app.

Go to System Preferences > Security & Privacy, under the General tab.How to allow apps not downloaded from the App store

However, if you really want to run software that hasn’t been signed and notarized (though I’d advise against this), you can. Once the app is developed, it will be available in the Google Play Store for Mac in no time. If macOS detects that an app has malicious content, it will notify you when you try to open it and ask you to move it to the Trash. Download Play Store For Mac Google Play Store for Mac: Google Play Store is an excellent application, which provides you with millions of Android applications. If your Mac is set to allow apps from the App Store and identified developers, and you try to install an app that isn’t signed by an identified developer or notarized by Apple, you also see a warning that the app can’t be opened. If you have set your Mac to allow apps only from the App Store and you try to install an app from elsewhere, it will say that the app can’t be opened because it wasn’t downloaded from the App Store. An app that has been notarized by Apple indicates that Apple checked it for malicious software, and none was detected. Preview, search and find Mac apps from the Mac App Store right from your Mac OS X Dashboard. If your Mac - like mine - is set to allow apps from the Mac App Store and identified developers, the first time you launch a new app, it asks if you’re sure you want to open it. Play store free download - AltServer, Adobe Flash Player, App Store Preview, and many more programs.

I personally leave the latter enabled and haven’t had any issues.
