If you have downloaded a "patched" Mac App Store file manually from a third-party website, you are taking a risk. The safer method is to let the tool patch the official file:
# Manual seed – works as of 2025 curl -O "http://swcdn.apple.com/content/downloads/00/42/001-12345/abcd1234/InstallMacOSX.pkg" macos catalina 1015 19a583 mac app store dow patched
A patched version of the is a modified copy of the official Install macOS Catalina.app (which contains the 19A583 build) that has been altered to: If you have downloaded a "patched" Mac App