I posted about this a few years ago but this problem remains unfixed.
I regularly make large "Blurb Photo Book"s in the LR Book Module that bump up against the 440 page limit using standard paper. I also have really lousy internet. I sometimes have to print a "PDF" book to a thumbdrive to upload at a different location with faster internet. This works well.
The problem occurs when I want to switch back to a "Blurb Photo Book" from "PDF" in the Book Module. I get the following error message:
Clearly this is a serious problem for me and one I dont dare try to experiment with to work around. I believe it would not be difficult to set the Blurb Photo Book paper to "standard" paper to avoid this problem.
My work-around has been to stay in the 'Blurb Photo Book' mode and for a PDF use the button in the lower left [Export as PDF]. The problem with this is that it is not possible to set 'quality, ppi, etc'
Alternatively always design in the 'Blurb Photo Book' mode and 'Duplicate' the saved Book Collection in the Collections panel. Use this 'copy' of the book to convert to 'PDF' mode, and the pages (>240) are preserved. If you want to change the book design- work in the 'Blurb...' book Collection and make another duplicate copy book collection for the PDF.
My guess is that Lr tries to conform to Blurb's requirements.
There is a Blurb help page that is interactive- Changing the paper quality limits the pages. (eg. Set pages to 241 and 'Standard' paper is the only selectable option.)
Yes I understand and my previous post wasn't clear. I meant to say that I will have to remain in the PDF mode only for the books that are currently PDF and greater than 240 pages. I can still edit them as needed in LR but they will always have to be exported to PDF.
New books going forward will be Blurb Photo Book and duplicated for PDF export.
And really how hard a fix would this be to fix this problem?
Thanks for your help. I feel a little stupid for not thinking of this myself.