Downloading and using modified, paid software without a license is considered piracy. In many jurisdictions, this can lead to fines or criminal prosecution.
Unfortunately, I couldn't find a reliable and safe free link to download Adobe Illustrator CS5 Portable. Adobe Illustrator is a commercial software, and downloading it from unauthorized sources may pose risks to your computer and violate copyright laws. adobe illustrator cs5 portable free link
If you're interested in using Adobe Illustrator but don't want to pirate the software, consider: Downloading and using modified, paid software without a