步骤如下：
Step by Step:
1. Download the gibMacOS Master folder
2. Right click and open gibMacOS.command
3. Let all the files download (may take 20 minutes or more)
4. Right click and open BuildMacOSinstallapp.command
5. Drag & Drop the InstallESDDmg.pkg file into the Terminal Window
6. Press enter and let the build happen. Takes a minute
7. Move Install macOS Catalina App (8.23 GB) into your Applications folder
