When attempting to install the Classroom Presentation Tool you may receive an error message:
Sorry, an error has occurred.
The application could not be installed because the installer file is damaged. Try obtaining a new installer file from the application author.
You can resolve this issue by doing the following:
- Quit the installer.
- Open the date and time preferences on your computer.
- Change the date on your computer to prior to October 30, 2017.
- Run the installer again.
- When the installer completes launch the application.
- When you have ensured that the application launches as expected, update your computer to today's date and time.