Hi Ira,
Yes, InDesign is the forward evolution of PageMaker.
You want to reprint, so...
Do you have the original PM files? They can be opened by those of us who have preserved an old install of PM6/7. This would get you into a new InDesign file for further editing.
Do you only have the PDF of the book? That can be opened in Acrobat Pro and the full text can be exported to a Word docx, which can be File > Place back into a new InDesign document.
Are there pixel-based pictures in the old book? If a PDF document exists, you can export them out all at once to an image assets folder and then File > Place the images into a new InDesign document.
If neither PM nor PDF exist anymore, then, yes, you can scan the pages and let Acrobat Pro optical-character-recognition the text and also export the text out to a Word docx again (for rebuilding into a new InDesign file). Yes, that will be time-consuming. One last thought: make sure those pages are scanned perfectly flat. Acrobat does a bad job of OCR-ing scanned pages that show curvature in 3 dimensions.
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