As of 2025, Apple’s Gatekeeper heavily scrutinizes downloaded DMGs. If you download Apple Configurator 2.13.3 from a third party, you must right-click -> Open to bypass Gatekeeper's first warning.
To use the Apple Configurator 2.13.3 DMG, your environment typically requires: : macOS Catalina 10.15.6 or later. apple configurator 2.13.3 dmg