: Modified "portable" programs are often heavily compressed and prone to bugs, random crashes, and slow performance because they lack official optimization. Modern Compatibility : Illustrator CS5 is a legacy 32-bit application. It is not compatible with modern macOS versions (like Catalina or later) or Apple Silicon (M1/M2/M3) Macs without extreme workarounds that often fail. Legal Consequences
You need an Intel Mac running macOS High Sierra (10.13) or Mojave (10.14) . It will not work on Catalina or newer. You also must install from the original DVD (no USB drive). Adobe Illustrator Cs5 Portable Free Download Mac
The last operating system to officially run CS5 applications is macOS Mojave (10.14). Why "Portable Free Downloads" are Risky : Modified "portable" programs are often heavily compressed