Adobe does not offer an official "portable" version of Illustrator CS3
If you are using a legitimate copy of Illustrator CS3 (released in 2007), you have access to several industry-defining tools that remain relevant for vector design: Adobe Illustrator CS3 Portable - Facebook adobe illustrator cs3 portable hot
Disclaimer: This article is for educational and historical archival purposes only. Adobe Illustrator is a copyrighted product of Adobe Inc. Downloading portable, cracked, or "hot" versions of software is illegal and poses significant cybersecurity risks. This content does not endorse piracy. Adobe does not offer an official "portable" version