For years, this software was available on physical CDs. Today, Adobe has officially discontinued the activation servers for the entire Creative Suite line. This means that even if you own an original physical disc, you likely cannot activate the software legally, pushing users to seek "cracked" versions online.
If you find a site offering a "free download" of Illustrator 11.0 today, you aren't finding a hidden treasure—you're likely looking at a digital relic or a security risk: adobe illustrator cs 11.0 free download
If cost is the primary factor, modern alternatives are safer than a 20-year-old pirated copy: For years, this software was available on physical CDs
: Scaled-down versions often available with cheaper plans or limited free trials. adobe illustrator cs 11.0 free download