This is the most reliable global source. Search for "Sinhala Ummagga Jathakaya" on Archive.org. You will find user-uploaded public domain texts dating back to the 1950s. Since the original translations (like the one by ) are no longer under strict copyright, these are 100% legal to download.
King Vedeha hires Mahosadha as the Royal Advisor. The elder minister, Kevatta, grows jealous. ummagga jathakaya sinhala pdf free download
In the
: A digital library dedicated to preserving Sri Lankan literature. This is the most reliable global source