Websites like YTMP3.cc, Convert2MP3, and others allow you to convert YouTube videos into MP3 files. You can search for the album or its tracks on YouTube and convert them. However, be aware of copyright laws in your country and the terms of service of these sites.
Avoid “free MP3 download” sites — they often contain malware, incorrect bitrates, or low-quality transcodes, and they deprive artists of royalties.
If you ignore advice and search for “def leppard hysteria album mp3 320kbps winker free,” here are red flags: