If you are looking for a lightweight or free vector design tool that matches the performance of an older version of Illustrator, consider these modern, secure alternatives:
Here is the warning you need to heed. Searching for "Adobe Illustrator CS3 Portable Edition.zip New" is one of the most dangerous queries you can make on the modern internet. Why? Because legitimate software from 2007 is no longer hosted officially. The only places offering these downloads are abandonware sites, torrent trackers, and shady file locker services.
You will read comments saying, "My antivirus says it's a virus, but it's just a crack." This is gaslighting. While keygens sometimes trigger heuristic alarms, genuine portable repacks of CS3 almost always contain unsigned, manipulated executables. Running them is equivalent to inviting a stranger to install hidden cameras in your home office.
If "portable" means you want to work without a heavy installation, these browser-based tools are excellent:
