printing Photo books from photos on my older Mac

I have spent a long time organizing and putting together a 56 page photo scrapbook on my older Mac desktop - 2012, using Photos - "projects" . When I went to "Buy Book" it says I needed to get lats app upgrade first. So i upgraded, and now it says that Sept 30 was last day to be able to buy and print a photo book from Apple- help!

There has got to be a way to print this project = or transfer to an app that can print??

Thanks for any help/advice

Merrypd