A: Technically yes, but security risk is high . Apple stopped releasing security patches for Catalina in November 2022. Only install this on an offline machine or for specific legacy software (Pro Tools, Adobe CS6, etc.).
Execute gibMacOS.command (Mac) or gibMacOS.bat (Windows). download macos catalina 10157 dmg file hot
How to Download macOS Catalina 10.15.7 DMG File Safely (2026 Guide) A: Technically yes, but security risk is high