I've found Google Slides to be very useful for this purpose. I create a short slide deck with an overview of the changes, along with screen captures so they'll know exactly what to expect.
I generally send a link to the shared slide deck, but I realized recently that my recipients might not be sure what to do with that link, or how to view the presentation in an easily navigable format.
|My previous method involved sending a link to the presentation, which opened in this preview mode.|
So, to make the process easier, I've started sending a link to the slides in presentation mode.
To do this, I click on 'Present in new window' under the Present button dropdown, and then copy the url in the new window that opens.
Now, when I share the link, the slide deck will open in presentation mode and the viewer can use the arrows on the keyboard to navigate.
I'm always looking for ways to streamline and improve how I support end users. Have suggestions or ideas to improve the process I've described above? I'd love to hear them in the comments!