Hi Maria,
Have you read through the documentation on the plugins?
https://stephensherrardplugins.com/docs/
I just did a test on my dev system with newest versions of everything, including the new WordPress release, and everything still works correctly.
Please note that you have to set up groups first, and then go back and edit the sheets and assign them to the groups, or to “none” if you don’t want a sheet to show up in any group, or “all” if you want a sheet to show up in each group. When using the group shortcode, make sure you spell the group name exactly the same as you did when you defined it in the groups settings.
Do you have a current/active license and the latest versions of the plugins?