If you cannot access the version you need via the official Creative Cloud app, and you do not own a physical copy with a valid serial key, downloading from a "warez" site is strongly advised against.
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If you Google "illustrator old version download best," the first five results are usually torrent sites or "cracked" software hubs. They are often loaded with ransomware, crypto miners, or keyloggers. If you cannot access the version you need
Downloading an older version of Adobe Illustrator depends primarily on how far back you need to go. Adobe officially supports a "current and one previous major version" (N-1) policy through their standard tools. Official Download Method (N-1 Versions) They are often loaded with ransomware, crypto miners,