In macOS 10.15 (Catalina) and below，The system restricts the installation of non-App Store downloaded applications by default to improve security.。If you need to install third-party software from non-App Store，You can follow the steps below： 安装非App Store软件的方法 注意：The following steps only work on macOS 10.15 and below 1. 打开“系统偏好设置” 点击屏幕左上角的苹果图标，Then select "System Preferences"。 2. 进入“安全性与隐私”设置 在“系统偏好设置”窗口中，Click "Security & Privacy"。 3.解锁设置 在“安全性与隐私...