Adobe Illustrator CS5 Portable is a non-official, modified version of the classic Adobe Illustrator CS5

• Copyright and licensing: Distributing or using cracked/portable versions violates Adobe’s license and copyright law in many jurisdictions.
• Terms of use breach: Even if you own a CS5 license, running a tampered executable may violate the license agreement.
• Ethical risks: Using pirated software harms creators and reduces incentive for support and development.

In summary, Adobe Illustrator CS5 Portable is a valuable tool for anyone who needs to work with vector graphics on the go, offering a range of powerful features and tools in a convenient and compact package.

4. Gravit Designer

Gravit offers a free tier of their powerful vector design software. It runs in the browser or as a standalone app, making it a true "portable" option that is safe and legal.