itch.io

Follow these instructions:

• Right-click the app   
• Click Show Package Contents   
• Open the Contents folder   
• Open the MacOS folder   
• Open a new Finder window.   
• Go to your Applications folder.   
• Open the Utilities folder   
• Open Terminal   
• Type in (without the quotes) "chmod +x "  
• Go to the first Finder window without hitting enter in Terminal   
• Drag the file with the same name as the app (and without an extension), and drop it into the Terminal window.   
• Click on the Terminal window and hit enter.