OS X Mavericks 10.9 represented a turning point in Apple's software history, transitioning the Mac operating system from feline-themed versions to California-inspired landmarks. It was notably the first version of OS X offered as a , a policy that continues with modern macOS releases.
Open the App Store on a compatible Mac and search for "Mavericks" in your mavericks os x 10.9.x dmg
The most reliable public source for a verified, unmodified is the Internet Archive (archive.org) . Look for uploads by known archivers (e.g., "Apple Certified" or "Macintosh Garden"). OS X Mavericks 10
Even with a perfect DMG, old hardware can be finicky. Here are the top 5 errors and fixes: mavericks os x 10.9.x dmg