Adobe Illustrator 2021 (v25.4.1) is a specific legacy version of the industry-standard vector graphics software. A "portable" version in a .dmg format typically refers to a modified, standalone version designed to run on macOS without a traditional installation process. Key Technical Specifications (v25.4.1)
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Unlike Windows, macOS is not designed to run complex software like Adobe Illustrator as a standalone "portable" executable. Adobe Illustrator 2021 (v25
: Version 25.4.1 was one of the early versions optimized for the then-new Apple Silicon (M1) chips Modern Alternatives and Access
Portable versions often lack the necessary background services (like the Licensing Service) to run reliably, leading to frequent crashes. Modern Alternatives and Access