The file you are referring to is typically associated with a pirated or "cracked" version
These DMGs are frequently bundled with adware or more serious security threats.
The search term logic pro x 10.3.3 mas tnt .dmg is a digital fossil—a relic of an era when Apple’s pro software cost $500 and cracking teams like TNT were household names in the warez scene. For a musician running a 2012 MacBook Pro on macOS Sierra, this version remains a lifeline.
: The standard disk image format for macOS used for software installers. Key Risks and Considerations