It is important to clarify upfront: and CS2 version 20 do not align with the year "2011." Adobe Illustrator CS5 was released in 2010, and CS6 in 2012.
It is important to clarify that Adobe Illustrator CS2 is obsolete software, and "Portable" versions found online are often risky. 2011 Portable Adobe Illustrator CS2 20
What actually exists are unofficial, risky, outdated repacks of a 2005 vector editor whose activation was disabled in 2011. While technically possible to run from a USB drive, the stability, security, and modern compatibility are disastrous. Adobe Illustrator CS2 (version 12, released in 2005)
An intuitive way to "fill" overlapping vector shapes with color without needing to manually join paths. What actually exists are unofficial, risky, outdated repacks
It is important to clarify a significant technical and legal point before providing a write-up: was released in 2005 , not 2011. The “2011” date often associated with CS2 refers to the end of its activation servers and the release of a “downgraded” version with serial numbers to keep it usable for existing owners.