Okay so after you downloaded/installed Pintos Online it shows you a game guard error right? Well as you may know a admin which I forgot the name basically did something to the game guard that now the game is game guard less. So..its very simple on how to fix it.
1. Go to your official Pintos Online folder.
2. Find a file that has the word "Game Guard" on it.
3. Delete it.
4. After that go to this file which is shown on the picture.
Pic- (The file is highlighted)
5. Click on it and the game will start.
There! Hope you have fun playing.
Also if it doesn't work then I don't know what to do then. It's working for me of course.