This is an excellent source for digital rare books. They offer a downloadable PDF of "The Hatha Yoga Pradipika of Svatmarama With the commentary Jyotsna of Brahmananda," originally published by the Adyar Library.
There are websites specifically designed to host documents. You can try these:
If you are writing an essay on this book, I can help you expand on: character analysis of Kirihami linguistic techniques used by Kumaratunga Munidasa A comparison between the folk elements and real-world moral lessons Hath Pana - හත් පණ - KBOOKS.LK
Because it is a copyrighted classic foundational to Sri Lankan education, purchasing a physical copy is highly recommended to support local publishing houses.
(හත් පණ) is a foundational masterpiece of modern Sinhala literature. Written by the renowned scholar, linguist, and writer Munidasa Kumaratunga , this classic children's novel has educated and entertained generations of Sri Lankan readers.
Here lies the central difficulty. A simple Google search for "hath pana pdf" yields a confusing landscape: