1. On Mac OS X double click on application. (If you see any message about problem with running, go Point 2).
On Windows go to "QuizPlayer b_1.8.7" folder and double click on "QuizPlayer beta 1.8.7.exe" file.

2. Hold down the "Ctrl" button and left-click on the application.

3. Click "Open" (This step must be done once for each new application).