Post by Perverteer in Tales From The Unending Void comments

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It could be GateKeeper preventing you from opening the app. Could you try the following?

Open Terminal.app
Write the following command: xattr followed by a space and drag the TFTUV.app or SL.app from the Finder onto the terminal window
Press Enter, it should show com.apple.quarantine as a result. If the text is not shown you’ve likely encountered another issue.
If the text is shown, type xattr -d com.apple.quarantine followed by a space and drag TFTUV.app or SL.app onto the terminal window again
Press Enter and try to launch the game again.

That did the trick! Thank so much Mr. P.

You should also be able to launch the game by right-clicking on the app in Finder and selecting Open from the context menu.