Contains macOS Sequoia Operating System. The operating system mentioned, macOS Sequoia (version 15), was released by Apple in September 2024. You can install it by yourself very simply. -Plug in the prepared bootable USB flash drive. -Restart your Mac (or power it on if it's off). -Immediately press and hold the Option (⌥) key. -Release the key when you see the Startup Manager screen showing the available bootable volumes. -Select the USB drive (often named "Install macOS [Version]") using your cursor or arrow keys and press Return. -The Mac will boot into the macOS Utilities window. From there, you can choose to install the OS (after potentially using Disk Utility to erase your internal drive, if a clean install is desired).