Platforms like Spotify, YouTube Music, and Pandora offer free tiers. You can listen to her entire catalog in high quality as long as you don't mind the occasional advertisement.
Downloading music for free bypasses the royalties that support the preservation of a legendary artist's work and estate. Better Ways to Listen for Free (Legally) roberta flack albums better free download
For an artist as meticulous as Roberta Flack, sound quality matters. If you truly want a "better" experience than a standard download, look for versions of First Take or Killing Me Softly on platforms like Qobuz or HDTracks. The clarity of her voice in these formats is vastly superior to any free file you might find on a pirate site. Platforms like Spotify, YouTube Music, and Pandora offer