If you are looking for a physical or digital copy, several modern authors have adapted the legend into novels or study guides: Nilavanti Granth In Marathi - Amazon.in
A note on the PDF format: Since this is an older text, ensure the PDF you have is searchable or has clear OCR (Optical Character Recognition), as some scanned manuscripts can be difficult to read on smaller screens. pdf book original nilavanti granth marathi upd