macOS 10.15.4 ISO/DMG 的最新镜像源。应用下载完成出现安装界面后退出,打开终端,在终端里面输入下面代码: hdiutil create -o /tmp/Catalina.cdr -size 8192m -layout SPUD -fs HFS+J hdiutil attach /tmp/Catalina.cdr.dmg -noverify -mountpoint /Volumes/install_build sudo /Applications/Install\ macOS\ Catalina\.app/Contents/Resources/createinstall