The filename you provided, Illustrator 28.6 -Monter Group-.dmg, refers to a specific cracked release of Adobe Illustrator v28.6 (released around June 2024) for macOS, distributed by a warez group known as "Monter" (or sometimes associated with broader monikers like "Monter Group" or similar repackers).
You will not receive critical security patches or new feature updates provided by Adobe. System Instability: Illustrator 28.6 -Monter Group-.dmg
Even if the Illustrator app is cracked, Adobe The filename you provided, Illustrator 28