For official support, tutorials, and security information regarding current and legacy versions, you can visit the Adobe Illustrator Support page.
This is the most critical section. It is proprietary, commercial software. Adobe Illustrator CS4 14.0.0 Portable
A "Portable" application is a version of software modified to run without a traditional installation process. Typically packaged into a single executable file, these versions are designed to run directly from a USB flash drive or a cloud folder without leaving significant traces in the host computer's registry. For official support