This is an updated comment – original disappeared (happens to me many times) and I worked with ScanPapyrus some more.
TLDR: I like this program!
Installed with no problems, I had an older version and installed this to same folder without un-installing older program.
Seems simple to use. I scanned a piece of sheet music and did not try to align the paper with edge of scanner. I’m very impressed with results! It straightened the page perfectly, no stair-stepping on the music score lines. All shading was removed and auto-crop saved everything it should with nothing extra. My scanner is a very old Epson 3170 Photo, it’s got to be 15 years old by now.
The good/bad/unexpected thing is that when I hit scan, it loaded in the Epson scanning software. So I had to adjust settings there as well, and tell Epson software to scan. When it finished, the output appeared in ScanPapyrus. It’s good that (I think) I can use all the features in the Epson software, like dust removal, color correction, de-screen and all the color curve, saturation, contrast settings. It’s bad because it adds several clicks and about 20 seconds to the first scan. After that, Epson software remembers my settings and seems to re-load faster, so it only adds about 5 seconds and 1 click. It’s unexpected that ScanPapyrus would not be able to scan on its own, but that may be due to the near-antique status of my scanner (got it when XP would not support my OLD scanner, it barely ran in Vista, runs great in Win 10 for some reason).
I scanned 4 sheets of music, all looked great, and then I was able to save them together as a 4-page PDF file with options to change the page order, rotation, or delete pages. Could even add to an existing PDF. So that part of my scanning process is now VERY easy and faster.
So your mileage may vary! I think this would work very well on newer scanners. I’m not concerned about the “recognition” part of the program requiring an additional license key purchase. My guess is the ScanPapyrus team has to pay for each OCR license it distributes, and they need to make some money also, so that’s fair. I use Abbyy Screenshot Reader or my favorite PDF viewer, PDF X-Change Editor, when I need a quick OCR, and there are free web services that do OCR and return very good results for converting longer documents.