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Don't waste time searching on sketchy direct download sites, better go to Spotify, Apple Music, or YouTube Music where all her discography is available. If you want to have the files on your computer, you can buy them on iTunes or Bandcamp, though Spotify is cheaper if you just listen to music without downloading. With streaming you get everything she recorded and you don't have to worry about viruses either.
Bandcamp has a section dedicated to Amy Winehouse where you can buy her discography in lossless quality if you care about having uncompressed files. Anyway, if you're already on platforms like Spotify or Apple Music, you have legal access to everything without paying per individual song, which is the most convenient way most of the time.
If what you want is to have the files saved on your computer without depending on the internet, iTunes is still a straightforward option - you buy each song or the full album and download it in decent quality MP3 format. There's also Amazon Music, which lets you buy and download albums offline all at once, without those monthly subscription schemes that end up being more expensive in the long run.
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