The allure of a free download is powerful, but downloading and running a portable version of Illustrator CS6 is akin to picking up a discarded USB drive in a parking lot and plugging it into your primary work computer. Here are the specific risks associated with these files.
Do not perform these steps. This is a theoretical breakdown of how the process works so you can identify malicious patterns.
To understand the situation, we first must define what the "Portable" version actually is.