PowerPoint - Countdown Timers for Windows 10

Countdown timers previously added using adobe flash don't work in Windows 10

The following links provide alternative options:

https://www.online-stopwatch.com/countdown-timer/

https://support.office.com/en-us/article/insert-an-on-screen-timer-4c3a70d3-8d59-4972-a368-8b4ffc31a606

https://www.tes.com/resources/search/?q=powerpoint%20timer (You need to create an account to use this)