Legitimate sources offer FLAC (lossless) or high-bitrate MP3s. Most illegal zip files are transcoded from 2004-era RealPlayer downloads. That iconic bass slide in "Longview"? On a bad zip, it sounds like mush.
Amazon allows you to download the album directly to your computer. Once purchased, you can right-click the files, select "Compress to ZIP file," and—voilà—you have created your own Green Day American Idiot Album Download Zip legally. Green Day American Idiot Album Download Zip
What makes this album even more unique is that Armstrong adapted it into a Broadway musical in 2010. When you download the album, you aren't just getting punk rock; you are getting a theatrical score. "21 Guns" (from the 21st Century Breakdown era, often confused with this album) and the "American Idiot" musical cast recording are also worth seeking out. Holiday (3:52) – "This is a standoff
If you find a zip file claiming to contain the "Musical Version," check the tracklist—the original album is superior for punk purists. Whatsername (4:12) – The haunting finale
Whether you find a legitimate zip or pirate it, here is the sacred tracklist you are expecting. Note the timings: it is a dense album.