First of all, this looks a bit tedious, but actually, its much simpler than the others! No trying to find paths and all that. Anyway, good luck!

1. Once you've downloaded the zip, extract it.
2. Right click the app and then click "show package contents".
3. Open the folder "Contents", then the folder "MacOS".
4. Open the app "Terminal".
5. Inside the shell, type "chmod +x " (make sure to leave a space at the end) then drag and drop the file from the folder you just navigated to onto the terminal window. This should add the file's path to the end of the line.
6. Click enter.
7. If it doesn't work, do "sudo chmod +x [file path from earlier]", enter.
8. You can now quit the terminal and close the finder window.
9. If you try to run the app, it may say “Digital Logic Sim” can’t be opened because Apple cannot check it for malicious software.
10. To fix this, just right click on the app, click "Open", and then click "Open" in the new popup.
11. The app should work now!

If you're wondering how this works, "chmod +x" makes a file executable. For some reason, Unity decided not to make the file executable. You might have noticed that the file you dragged and dropped into the terminal has changed its icon. It says "exec", which means its executable.