: 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
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Illustrator Cs5 can't open in my new imac… - Apple Community : Modified "portable" programs are often heavily compressed