We are aware of the issue ( Apple is complicating things for open source developers to put their software in Mac computers by forcing us into a developers program -and paying for it- to give their certificate)
Right now the only option to go around it is to allow for CE installation forcing the iOS to allow you to install:
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In the Finder on your Mac, locate the Collect Earth installer. Don’t use Launchpad to do this. Launchpad doesn’t allow you to access the shortcut menu.
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Control-click the app icon, then choose Open from the shortcut menu.
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Click Open.
The app is saved as an exception to your security settings, and you can open it in the future by double-clicking it just as you can any registered app. Let us know if this process is not working.