Yearly i use a program called https://www.sheppardsoftware.com/ with my Middle School students and it uses flash player. This is free for me and my students. Please reconsider discontinuing it or come up with a converter of some kind. This tool is invaluable to students and teachers.
There is no solution. This was announced three years ago, to give plenty of time to create alternatives. All the big players are working together to make sure Flash Player closes down on-time, and closing all the loopholes so people don't find ways to run it.
Have you contacted the folks at Sheppard Software to find out if they're converting their content to a different technology? Adobe, and software vendors, announced Flash Player's end-of-life over three years ago giving content providers ample time to migrate their content to a different technology.
Thanks for the feedback. You're going to need to find or create alternate content for your classroom. Flash Player will no longer work after 2020, and most browsers will remove support for all plug-ins at that time.
For completeness, here's a link to the original announcement from 2017:
Here's a link to our FAQ:
HARMAN has an ongoing support program for Flash, post-2020, but it's very much not free. Sheppard Software could, in theory, engage with HARMAN to find a solution to keep their content working (most likely by packaging that content as a desktop application). It's possible, if your district manages individual computers like an enterprise, that you could license and distribute a maintained Flash Player from HARMAN to your managed computers that allows Flash to play the Sheppard Software content that's important to you.
More details on options for enterprise can be found here: