Portable versions may lack key features or crash frequently.
Unfortunately, I couldn't find a reliable and safe free link to download Adobe Illustrator CS5 Portable. Adobe Illustrator is a commercial software, and downloading it from unauthorized sources may pose risks to your computer and violate copyright laws.
After the trial, subscriptions start at around $20.99/month (or $54.99/month for All Apps). Student and teacher discounts bring it down to $19.99/month for all apps. adobe illustrator cs5 portable free link
Adobe Illustrator CS5 Portable: A Complete Overview and Safe Alternatives
Adobe never officially released a portable version of CS5. All "Portable CS5" files are unauthorized modifications made by third parties. The Dangers of "Free Portable" Links Portable versions may lack key features or crash frequently
A powerful, completely free, and open-source vector graphics editor. Inkscape natively supports the SVG format and offers a legitimate portable version via PortableApps.com that is safe and free from malware.
Adobe offers a 7-day free trial of the fully unlocked, modern version of Illustrator CC, giving you access to the latest AI tools and cloud features. After the trial, subscriptions start at around $20
Distributing or using pirated software violates copyright laws. Organizations and individuals can face steep fines or legal action for utilizing unlicensed creative tools. Why Adobe CS5 is Outdated
A "portable" application is a modified version of software designed to run without a traditional installation process. Users typically copy these versions onto a USB flash drive or external hard drive, allowing them to run the program on multiple computers without modifying the host system's registry.
Downloading and using unauthorized portable software carries several significant risks: Security Threats : "Portable" versions are often bundled with malware, spyware, or keyloggers