There is no official "Adobe Illustrator CS8" or "1800 Final" version. The naming confusion often comes from:

Using unlicensed software is a violation of copyright law. For professionals, using pirated software can lead to lawsuits and reputational damage if discovered by clients or auditors.

If you are looking for specific content or updates related to this or adjacent versions, Key Version Clarification

While the 18.0.0 build was revolutionary at launch, using it today presents some challenges: