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The Complete Guide to Mac OS X Yosemite 10.10.5: How to Get the Official DMG Download Link

Mac OS X Yosemite (version 10.10.5) holds a special place in Apple’s operating system history. Released in August 2015, 10.10.5 was the final, most polished iteration of the Yosemite line. To this day, thousands of users with older Mac Pro towers, MacBook Airs (2011–2014), or legacy software need the official Mac OS X Yosemite 10.10.5 download DMG link to perform clean installs, create bootable USB drives, or revert from slower newer OS versions.

But finding a legitimate, malware-free DMG link for a nine-year-old operating system can be a minefield. This article provides everything you need: what Yosemite 10.10.5 is, where to source the official installer, how to convert it to a DMG, and what to do if Apple’s links no longer work.

Steps to Extract the DMG from the Installer

If you have the Yosemite installer (from App Store/Purchase), you can extract the DMG:

  1. Open Terminal and run: 
    hdiutil verify /Applications/Install\ OS\ X\ Yosemite.app
hdiutil convert -format UDTO -o ~/Desktop/Yosemite.dmg /Applications/Install\ OS\ X\ Yosemite.app
  2. This will create a Yosemite.dmg file on your desktop.

Method 2: Apple’s Support Article (Direct Link for Older macOS)

For users without purchase history, Apple provides a direct download link via a support document. The catch: it only works on a Mac already running an older OS (like Mavericks or El Capitan).

Visit Apple’s support article HT206208 (search online for “How to upgrade to OS X Yosemite”). As of 2025, the link still redirects to a downloadable InstallMacOSX.dmg. The direct URL pattern (which changes occasionally) is: mac os x yosemite 1010 5 download dmg link

https://updates.cdn-apple.com/.../InstallMacOSX.dmg

Because the exact hash changes, it’s safer to search for “Apple support download Yosemite 10.10.5” and click the official support.apple.com link. When the page loads, click the “Get OS X Yosemite” button. This will launch the App Store with a redemption code automatically applied.

Converting the Yosemite Installer into a Standalone DMG

Once you have the Install OS X Yosemite.app (inside the downloaded DMG or from the Applications folder), you can create a portable DMG file for safekeeping or sharing across multiple Macs.

6. Conclusion: The Twilight of OS X

Yosemite 10.10.5 is currently in a difficult stage of life. It can no longer run the latest versions of Chrome, Slack, or Microsoft Office efficiently due to API changes and security protocols. It does not support APFS file systems natively, meaning it is restricted to HFS+ drives. The Complete Guide to Mac OS X Yosemite 10

However, for users with a Mid-2007 to Mid-2015 Mac (like the MacBook Pro Retina or the iconic Mac Pro "Trash Can"), Yosemite 10.10.5 remains a visually striking, stable snapshot of Apple's design revolution. If you must download the DMG, prioritize the Combo Update from Apple Support over full installers from unverified mirrors to ensure your legacy hardware remains safe and functional.

REPORT: Mac OS X Yosemite 10.10.5 Download (DMG)

Status: Discontinued/Legacy Software Current Support Status: No longer supported by Apple (Security updates ended in 2017). Official Availability: Apple does not provide a direct public web link for Yosemite on its main support pages, redirecting users instead to newer OS versions.

However, Apple maintains a hidden "legacy" support article where the official installer can be downloaded, provided you are accessing it from a compatible Mac. This will create a Yosemite

Final Checklist: Installing Yosemite 10.10.5 from DMG

  1. Back up your current system using Time Machine.
  2. Download the genuine DMG (5.2–5.8 GB) from Apple via the purchase history or support article.
  3. Verify the SHA-256 checksum.
  4. Open the DMG – drag the Install OS X Yosemite.app to your Applications folder.
  5. Run the installer from within your current macOS (downgrade) or boot from a USB drive (clean install).
  6. Follow on-screen prompts – the installation takes 20–40 minutes.

Official (Hidden) Download Sources

While I cannot host files directly, the most reliable method to get a clean, unmodified DMG is via Apple's own hidden catalog.

For 10.10.5, you are often looking for the "Combo Update" installer or the full installer. The standard URL structure for Apple updates usually directs to a .dmg file.

  • The Combo Update (approx. 1.06 GB): This updates any version of Yosemite to 10.10.5. It is a standard DMG that mounts to reveal a .pkg installer.

    • Historical URL Reference: https://support.apple.com/kb/DL1849 (This often redirects to the download CDN).

  • The Full Installer (approx. 5.5 GB): Getting the full OS as a DMG is harder.

    • The App Store link is usually: macappstore://itunes.apple.com/app/id915041082 (This may only work if you have "purchased" it previously on that Apple ID).

8. Summary Checklist

| Action | How to Perform | |--------|----------------| | Obtain the official installer | Use the Mac App Store → Purchased → Download “OS X Yosemite”. | | Verify integrity | The installer is signed by Apple; macOS will validate the signature automatically. | | Upgrade to 10.10.5 | After installation, download the 10.10.5 Combo Update from Apple Support and run the .pkg. | | Create bootable media (optional) | Use the createinstallmedia command to produce a USB or DMG installer. | | Install on target Macs | Boot from the USB (Option‑key at startup) or mount the DMG and run the installer. | | Maintain security | Apply all available updates, consider third‑party security tools, and keep backups. |