Hey! Are you running the terminal in the same directory as the app? Also, have you moved the app to your Applications folder?
Maybe try this? It seems to be a permissions issue with the ZIP
For Mac users who’ve downloaded an .app, you’ll need to do a bit of Terminal maintenance. Right-click the .app, navigate to /Contents/MacOS, and find the single Unix executable file. Open a terminal window and type in “chmod +x “, then drag in the Unix executable. You should wind up something that looks like this:
chmod +x /Users/UserName/Downloads/Terra Nil.app/Contents/MacOS/TerraNil
Hit enter, you should see the icon change, and your .app should be good to go!
Did it several time, tried running the terminal from different folders, it always, however says:
usage: chmod [-fhv] [-R [-H | -L | -P]] [-a | +a | =a [i][# [ n]]] mode|entry file ...
chmod [-fhv] [-R [-H | -L | -P]] [-E | -C | -N | -i | -I] file ...
And the file icon doesn't change, it remains blank. Btw it previously asked for my password, now it doesn't. Maybe i should do something with the .zip itself? Dunno.