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Select your internal hard drive (usually named Macintosh HD ) from the sidebar. Click the button at the top. Set the parameters exactly as follows: Name: Macintosh HD

Click "Get" to download the installer via System Preferences. Method 2: Direct DMG/PKG File Select your internal hard drive (usually named Macintosh

Choose – it will download the full InstallAssistant.pkg (convertible to DMG).

Late 2013 or newer (2010–2012 models are not officially supported) Hardware Requirements: Memory: Minimum 4GB RAM (8GB+ recommended). Method 2: Direct DMG/PKG File Choose – it

Press the button while simultaneously holding down the Option (Alt) key. Release the key when the startup manager screen appears.

This guide provides the official methods to download the installer, create bootable media, and perform a flawless clean install. 1. Check System Compatibility Release the key when the startup manager screen appears

Click in the top-left corner and select Show All Devices .

If you have the Install macOS Catalina.app , use it to create a USB installer:

If you are using a newer Mac and need to download Catalina for an older machine, use the command-line interface.

Open and identify the exact name of your USB drive.