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

Notice：The following steps only work on macOS 10.15 and below

1. 打开“系统偏好设置”

Click the Apple icon in the upper left corner of the screen，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.Unlock settings

在“安全性与隐私”窗口的左下角，Click the lock icon to unlock settings。You will be prompted to enter your administrator password。After entering the password，Click "Unlock"。

4. 允许任何来源的应用程序

在“允许从以下位置下载的应用程序”部分，You will see three options：App Store、App Store and identified developers。Select "Any Source"。(Notice：In macOS 10.15 and above，There may not be this option。If this option is not available，Other solutions you can try，To bypass this restriction, use right-click on a file。）

5. 重新锁定设置

点击左下角的锁形图标，to lock settings and protect your security settings。

6.安装软件

Now，You can double-click and run apps downloaded from other sources。If you encounter the "Cannot open the application" prompt，Please right click on the application icon，Select "Open"，Then click "Open" to confirm you trust the app。

go through these steps，You can install software from non-App Store in macOS 10.15 and below。

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