If you need to change two paragraphs, it may suffice. If you need the cover identical, stay on the PDF or rebuild in an imposer.
Scans without OCR land as images in Word. Run OCR scan first if the sheet is a photo.
This is not the suite that invented the PDF. Illustrated lookbooks, baseline grids and wrap-arounds will move. Laboratory spread: listed so you can find it, not sold as a layout tool.
Guest flow: leave the sheet, watch the plate, download. For history and Studio stock, open an account — after, not before.