download extensions for iphoto

What app are you using: iPhoto or Photos? Also what version. If it's iPhoto then there are no extensions for it. But there's still hope if you can create a PDF file of the book.

Are you able to create a PDF file for that book?  If so there's a 3rd party book provider which used to do printing for Apple, Mimeo, that will take PDF files created by iPhoto and print and bind books. Use the Mimeo link for direct access to the Apple Photo Project Ordering Service web page. 

Or you can upload the PDF file to PrestoPhotos which can also print and bind books from iPhoto or Photos pdf files.

Create the pdf file according to this Apple document: Preview a print project in Photos or iPhoto to avoid issues - Apple Support.

For me the "Preview" link is no longer working, OT. Can you still see the page from the other side of the great pond? We may be seeing different servers in our countries.

I an now using the link to the saved version on the Internet Archive: https://web.archive.org/web/20170614002828/https://support.apple.com/en-us/HT201504

I clicked on that link and got the archived version of it. Then tried again and got the error message.