If you are looking for CS6 specifically, you are likely interested in the , which introduced native 64-bit support for significantly faster handling of complex artwork.
Downloading a "portable" version of Adobe Illustrator CS6 from sites like FileHippo is not recommended due to significant legal, security, and performance risks
You will not receive official security patches or bug fixes, which are critical for running old software on modern operating systems like Windows 10 or 11. Legitimate Free Alternatives