Even if you managed to find a legitimate, legal copy of Adobe Illustrator 9.0 on a physical CD-ROM, it is highly unlikely to function on a modern computer.
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Some websites claim that because Adobe no longer sells Illustrator 9, it is “abandonware” and therefore legal to download for free. This is false. Abandonware has no legal standing in most jurisdictions. Copyright law does not contain an abandonment clause. The software remains protected until 70+ years after the death of the creator (in the US and EU). So, downloading Illustrator 9 from an abandonware archive is still piracy. Even if you managed to find a legitimate,
Files bundled with pirated serial numbers are often modified or corrupted. They can cause system instability, registry errors, and operating system crashes, especially on modern computers. The Legal and Technical Reality of Adobe Illustrator 9.0 This is false