Mimeo problems with Monterey

After four days of dealing with this, I am appealing to anyone here who can help. I had a 120 page book ready to purchase in Mimeo. Before I did it, there was a window saying I needed to update Mimeo. Stupid me did it before I ordered the book. Afterwards, nothing worked. The book disappeared and I couldn't open anything. After talking to three Apple people and three Mimeo reps, I updated my imac from High Sierra to Monterey. I was able to see the project, but suddenly half the photos were missing and no matter what I've tried, I can't get them back. Mimeo told me to use an appcleaner to delete Mimeo, shut down, and then reinstall it from the App store. I did that three times and nothing worked. When I open previous projects that I've done, I am also missing pictures. Mimeo has been of no help. They promised to get their "team" on it, but never got back to me and they seem to send me to the same person on the chat and email all the time. I have done many books with them and never had a problem before this. Apple is suggesting that I buy a new computer. Before I do that, I need to see if there is anything else I can do to restore the book I made in its original form. The missing photos are also missing from the Photo selection on the right side of the mimeo template. It also won't allow me to purchase anything at this time. I am so frustrated as one of my greatest pleasures is making photo books. Can anyone help me?

[Re-Titled by Moderator]