1. Oracle VM VirtualBox 6.1 (https://www.virtualbox.org/)
2. Install Oracle VM VirtualBox 6.1 Extension Pack (https://www.virtualbox.org/)
2. Download macOS Catalina VirtualBox Image (VMDK file format) by Geekrar
3. Download VirtualBox Boot Image (VMDK file format) by Geekrar
Setting of VirtualBox
Before Installation of Catalina (in Command Prompt)