Yes. Fortunately, you have a few other options to reinstall your OS. Your Mac has a built-in recovery system that you can use. Here are your options: 1. Turn off your computer. 2. Hold down “Command + Option + Alt + R” and press the power button. 3. You’ll see the words “Starting Internet Recovery.” 4. A progress bar will appear on the screen. Wait for all the processes to complete. 5. Your Mac will automatically reboot.