Unfortunately, No.
As a general rule, you should aim to complete your photo book projects within a couple of months. We do not advise working on a single project for years, as technology and platforms and costs are continually changing (often beyond our control). If you have a truly long-term project, we strongly recommend breaking it down into separate volumes that can be printed as completed.
Our Cahoots Easy Editor for Windows and Cahoots Pizazz for macOS and Easy Designer for Windows and macOS were all licensed from third parties and once the agreements are terminated, we are no longer able to process files from those applications. By extension, this means that all your .epb and .dtp/.dtpx files will no longer be of any practical use. However, in some cases you may possibly be able to cut and paste between old and new applications to most easily recreate your book with updated tools.