Here’s a properly worded, safe, and informative response regarding your query for “Mac OS X Yosemite 10.10.5 download DMG” :

Important Note: Apple no longer provides Mac OS X Yosemite (10.10) through the main App Store interface for modern macOS versions. However, if you need this specific version for an older Mac or legacy software, here is the correct, official method to obtain the Yosemite 10.10.5 DMG or installer. Official Download Method (Apple Direct) Apple still hosts installers for older OS versions via direct links, but they are typically distributed as an .app bundle (not a raw DMG). To get the legitimate Install OS X Yosemite.app (which can be converted to a DMG if needed):

Use an Apple-supplied link (open in Safari on a Mac that supports Yosemite or an older OS): macappstores://itunes.apple.com/app/id915041082?mt=12 This will open the Mac App Store to the Yosemite page.

If the above fails , sign in to a Mac that previously “purchased” Yosemite under your Apple ID. Go to the Purchased tab in the Mac App Store, find “OS X Yosemite,” and download it.

Create a DMG from the installer (after download):

The installer will be in /Applications as Install OS X Yosemite.app . Right-click it → Show Package Contents → Contents/SharedSupport/InstallESD.dmg . That InstallESD.dmg is the bootable system image (exact 10.10.5 version if you downloaded the final release).

What to Avoid

Do NOT download “Yosemite.dmg” from third-party sites (e.g., Softonic, CNET, random file hosts). They often bundle malware, adware, or modified system files. Do NOT use BitTorrent or unverified ISO/DMG files — they are frequently unsafe.

System Requirements (Yosemite 10.10.5)

Mac introduced in mid-2007 or later (excludes some early 2007 iMacs/MacBooks). At least 2 GB RAM, 8 GB free storage. Runs on Intel Core 2 Duo, Core i3/i5/i7, or Xeon.

Why Yosemite 10.10.5 Specifically? Version 10.10.5 is the final, most stable release of Yosemite. It includes security updates and bug fixes not present in earlier 10.10.x versions.

Final recommendation: If you just need a bootable USB or recovery DMG for Yosemite 10.10.5, download the official installer via Apple’s link above, then extract InstallESD.dmg . That is the proper, safe, and legal way to obtain the file.