In this case the game won't launch and show this message:

The fix is:

1. After you download the game and extract the zip, you should have the app file (or folder).
2. Try launching the game. If above alert show, then,
3. Right click the app.
4. Then, show package contents
5. Click contents.
6. Then, locate the file "W.A.T.C.H. ~Truth Beyond Time~ [DEMO].pck" inside Resource folder.
7. Copy or cut that pck file, then leave the Resource folder then, paste it inside MacOS folder.
8. Then, try executing the app. It should be running now.