OS X Mavericks no longer receives security updates from Apple. Using it as your primary operating system for web browsing is risky. If you must use it, ensure you use a modern, third-party browser that still supports 10.9 (if any remain) or keep the machine offline for specific legacy tasks.
If the Terminal command fails, you can use Disk Utility to "Restore" the InstallESD.dmg onto your USB drive. However, this method often requires additional steps to make the drive truly bootable (like moving the BaseSystem.dmg ). System Requirements for Mavericks Before installing, ensure your Mac is compatible: : Mid-2007 or newer MacBook Air : Late 2008 or newer MacBook Pro : Mid-2007 or newer Mac Mini : Early 2009 or newer Mac Pro : Early 2008 or newer RAM : 2GB minimum (4GB recommended) Storage : 8GB of available space ⚠️ Important Security Note
It is used for installing Mavericks on virtual machines (like VMware or VirtualBox).
is a legitimate resource for preserving software history.
download an InstallESD.dmg from a random forum post (like InsanelyMac or TonyMacx86) unless the uploader has provided a verifiable checksum (MD5/SHA1).