Mac Update Os

Updates downloadURL checksum.

Use Software Update

My mac is stuck on OS X Yosemite 10.10.5 and won’t update past that, no updates on app store no nothing, I recently bought an iPhone x and iTunes won’t let me sync my old iphone back up because it needs an update which i cannot get, its frustrating me, I don’t know what to do anymore, I’ve looked everywhere on the internet and can’t find a solution.
When Software Update says that your Mac is up to date, the installed version of macOS and all of its apps are also up to date. That includes Safari, Music, Photos, Books, Messages, Mail, Calendar, and FaceTime.

Choose System Preferences from the Apple menu , then click Software Update to check for updates.
If any updates are available, click the Update Now button to install them. Or click “More info” to see details about each update and select specific updates to install. You might be asked to enter your administrator password.
When Software Update says that your Mac is up to date, the installed version of macOS and all of its apps are also up to date. That includes Safari, Music, Photos, Books, Messages, Mail, Calendar, and FaceTime.
To automatically install future updates, including for apps that you got from the App Store, select “Automatically keep my Mac up to date.” Your Mac will notify you when updates require it to restart, so you can always choose to install those later.

Learn how to update your iPhone, iPad, or iPod touch to the latest version of iOS or iPadOS.

Learn how to get updates for earlier versions of macOS that don't include Software Update preferences.
You can also use the App Store to update apps or redownload apps that came from the App Store.
Learn which macOS your Mac is using and how to upgrade to the latest macOS.
When your Mac is connected to a Personal Hotspot, large updates don't download automatically.