Today macOS Catalina is the latest Apple OS. But The method for creating bootable media for macOS 10.15.3 is no different from the previously released macOS 10.14 Mojave.
To make installer we need a Terminal:
1. Run the program, enter sudo and do not forget to put a space
2. Click the right mouse button on the macOS Catalina image file and select “Show package contents”. In the window that opens, find the file createinstallmedia and drag it into the Terminal window.
3. Next, type the command –volume, put a space and drag the icon of the previously created flash drive into the Terminal window.
4. Type the command –applicationpath, put a space, drag the image with macOS 10.15 into the Terminal window.
5. Press Enter. To confirm the action you need to use the Y button
Now you have to wait pretty much – the creation procedure takes a lot of time, on average, from 10 to 30 minutes.
You CAN {Download} 10.15 Catalina