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While Apple does not publicly offer a full .dmg installer for Catalina, several trusted third‑party archives have preserved the final 10.15.7 build (internal build number 19H2). One widely referenced source provides a direct download with full checksums for verification:

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This error usually indicates a corrupted download or an expired certificate. Set your system date to a time when the installer was still signed (e.g., 2020) temporarily, or use the --allow‑untrusted flag when creating a USB installer. While Apple does not publicly offer a full

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Users who want the complete Install macOS Catalina.app for creating a bootable USB installer.