If you need true portability, embrace Inkscape Portable . It is open-source, constantly updated, and legally free. If you specifically need the Illustrator interface, consider buying a used CS6 license from a third-party reseller (though Adobe no longer supports activation servers reliably).
Navigate to the folder and double-click Illustrator.exe or PhotoshopPortable.exe (depending on the repacker). Adobe Illustrator CS5 V15.0.2 Lite Portable Setup Free
If you are looking for a legal alternative, skip to the next section. If you are exploring abandoned/archival software: If you need true portability, embrace Inkscape Portable
The file is usually a .7z , .rar , or .zip archive ranging from 180–300 MB. Navigate to the folder and double-click Illustrator
The portable launcher will often create a fake "home" directory inside the USB folder (e.g., \Data\Settings ). This is normal. No Windows registry is touched.
Use 7-Zip or WinRAR to extract the contents to a folder named AI_CS5_Portable on your desktop or USB drive.