让您的 Mac 保持更新(keep your Mac updated)是个好主意，以便您从最新的安全补丁、改进的性能和新功能中受益。但是，您可能无缘无故无法成功更新您的Mac 。以下是导致此问题的最可能原因以及解决方法。
您可能还想查看我们的文章，了解如果您的软件更新卡在 Mac 上下载或安装时(software update is stuck downloading or installing on your Mac)该怎么办，以及如何从终端更新 macOS(update macOS from the Terminal)，以防Apple Store出现问题。
1. 你的 Mac 需要重启
无论如何，重新启动计算机是解决Mac(Macs)或任何其他平台上大多数计算机问题的技巧之一。
2.你没空间了
某些 macOS 更新需要在您的硬盘驱动器上有相当大的空间来下载和安装。对于只有 128GB 内部存储的MacBook(MacBooks)来说尤其如此。解决方案是释放系统上的空间：
- 将(Move)大文件移动到外部驱动器或云端。
- 卸载不再使用或不常使用的应用程序。
- 清空(Empty)bin 并删除临时文件。
如果您想知道如何在Mac上获得更多空间，请查看如何在 Mac OS X 计算机上快速释放空间(How To Free Up Space On Your Mac OS X Computer FAST)。
3. 你的互联网连接不稳定(Flaky)
macOS 更新反复失败可能是由于您的互联网连接不稳定并反复掉线。虽然在本文中列出的互联网性能不佳的可能原因太多了，但8 种简单的网络连接故障排除方法(8 Easy-to-Do Ways to Troubleshoot a Network Connection)是开始寻找原因的好地方。
修复互联网问题也可能解决更新问题。
4. 苹果服务器不堪重负
您的Mac可能没有更新，因为Apple目前没有足够的服务器容量来帮助您，可能是在新的流行更新可用之后。例如，在对 macOS 的下一个版本进行重大更新期间。
您可以通过访问Apple 系统状态(Apple System Status)页面快速检查 Apple 的服务器是否已关闭。
5. 你的 Mac 不支持(Support)最新(Latest)的macOS 版本
(Apple)在为其硬件提供长期软件支持方面，Apple是最好的公司之一，但最终，您的Mac将太旧而无法运行最新版本的 macOS。
如果您无法更新您的Mac，请检查新版本的 macOS 是否与您的(new version of macOS is compatible with your )Mac机型兼容。如果您尝试手动安装新版本的 macOS，这只是一个问题，因为Apple不会为您提供与您的Mac不兼容的更新。
6. 您的更新因某种原因被(Reason)卡住(Stuck)
有时 macOS 更新总是卡住并且不会给您错误消息。为什么会发生这种情况以及如何解决此问题需要有自己的文章。幸运的是，我们刚刚为您准备了这篇文章——如何修复 Mac 软件更新卡住安装(How to Fix Mac Software Update Stuck Installing)。
7.软件更新应用程序本身(Software Update App Itself)就是问题(Problem)
在某些情况下，macOS 内置的更新程序应用程序存在问题。苹果的更新系统集成到Mac 应用(Mac App)商店；因此，如果商店不工作，更新可能会失败。
解决此问题的一种方法是手动从 Apple 的更新下载页面下载更新。(update download page)累积大量更新的所谓“组合”更新是最受欢迎的。安装这些更新类似于重新安装 macOS，但它们只会刷新系统文件而不会触及您的个人信息。这应该修复自动更新系统。
8. 第三方软件(Software)或系统(System) 设置(Settings) 干扰(Are)更新
有时，由于系统设置或第三方应用程序的干扰，您的更新可能无法完成或启动。
通常，解决此问题的最快方法是以安全模式(Safe Mode)启动Mac，然后应用更新。安全模式在稳定的环境中启动，这应该可以解决许多可能干扰更新的问题。
9.你的磁盘有问题
我们已经将磁盘空间作为一个潜在问题进行了介绍，但是您的系统驱动器可能会出现许多问题。定期检查磁盘是否有错误是个好主意，尤其是当更新无法下载、安装或以其他方式正常工作时。
您可以使用 Apple 的Disk Utility来运行First Aid，但您可能还想查看我们的Clean My Mac X Review以了解第三方选项。
10.你太着急了
用户通常会低估更新的安装时间。在您认为更新失败或卡住之前，请给它一些时间。让更新在一夜之间运行，如果他们没有在早上完成，这是他们实际上失败的一个好兆头。
重新安装 macOS
如果以上提示都没有帮助您在Mac上安装最新版本的 macOS ，您也可以尝试核选项。macOS恢复是所有(Recovery)Mac(Macs)上的内置功能，可让您从系统或互联网重新安装 macOS。
要使用它，请关闭Mac，然后按电源(Power)按钮将其打开。立即(Immediately)按住Command + R键。您也可以按住Option + Command + R（将安装与您的系统兼容的最新版本的 macOS）或Shift + Option + Command + R（将安装您的系统随附的 macOS 版本）。
如果您有一台带有Apple Silicon（M1 等）的较新Mac ，那么您必须按住电源按钮，即使在系统开机后也必须按住它。(Mac)稍等片刻，您将看到启动选项窗口。
保持 Mac 更新
虽然更新您的Mac是个好主意，但有时更新导致的问题比它们解决的问题还多！希望本文能让您更接近了解为什么无法更新您的Mac以及您可以采取哪些措施来修复它。
Can’t Update Your Mac? Here Are 10 Reasons Why
Іt’s a good idea to keep your Mac updated so that you benefit from the latest security patches, improved performance, and new features. However, it can happen that you can’t update your Mac successfully for no apparent reason. Here are the most likely causes for this issue and how you can fix them.
You may also want to check out our articles on what to do if your software update is stuck downloading or installing on your Mac and how to update macOS from the Terminal in case something is wrong with the Apple Store.
1. Your Mac Needs a Reboot
Whatever may be the case, rebooting your computer is one tip that solves the most computer problems on Macs or any other platform.
2. You’re Out of Space
Some macOS updates require quite a bit of room on your hard drive to download and install. This is especially true of MacBooks with only 128GB of internal storage. The solution is to free up space on your system:
- Move large files to an external drive or the cloud.
- Uninstall applications you no longer use or use infrequently.
- Empty the bin and delete temporary files.
If you’d like to know how to get more space on your Mac, check out How To Free Up Space On Your Mac OS X Computer FAST.
3. Your Internet Connection Is Flaky
Repeated failure to macOS updates might be due to your internet connection being unstable and dropping repeatedly. While there are far too many possible reasons for poor internet performance to list in this article, 8 Easy-to-Do Ways to Troubleshoot a Network Connection is a great place to start looking for the cause.
Fixing the internet issue might resolve the update problem as well.
4. Apple’s Servers Are Overwhelmed
It’s possible that your Mac isn’t updating because Apple doesn’t have enough server capacity to help you at the moment, possibly after a new popular update becomes available. For example, during a major update to the next version of macOS.
You can quickly check if Apple’s servers are down by visiting the Apple System Status page.
5. Your Mac Doesn’t Support the Latest macOS Version
Apple is one of the best companies when it comes to long-term software support for its hardware, but eventually, your Mac will be too old to run the latest version of macOS.
If you can’t update your Mac, check whether the new version of macOS is compatible with your Mac model. This is only an issue if you’re trying to manually install a new version of macOS as Apple won’t offer you an update that isn’t compatible with your Mac.
6. Your Update Is Stuck for Some Reason
Sometimes a macOS update perpetually gets stuck and does not give you an error message. Why this happens and how you can fix this issue warrants its own article. Luckily, we have just the article for you – How to Fix Mac Software Update Stuck Installing.
7. The Software Update App Itself Is the Problem
In some cases, the updater application built into macOS has issues. Apple’s update system integrates into the Mac App store; therefore, updates may fail if the store is not working.
One way to get around this is to download updates from Apple’s update download page manually. So-called “combo” updates that accumulate a large number of updates are the most popular. Installing these updates is akin to reinstalling macOS, but they will only refresh system files and not touch your personal information. This should fix the auto-update system.
8. Third-party Software or System Settings Are Interfering With Updates
Sometimes your updates may be failing to complete or launch because of interference from system settings or third-party apps.
Usually, the fastest way around this is to start up your Mac in Safe Mode and then apply updates. Safe Mode starts up in a stable environment, which should sort out many issues that can interfere with updates.
9. Your Disk Has Problems
We’ve already covered disk space as one potential issue, but there are many things that can go wrong with your system drive. It’s a good idea to check your disk for errors at regular intervals, more so when updates aren’t downloading, installing, or otherwise working correctly.
You can use Apple’s Disk Utility to run First Aid, but you may also want to check out our Clean My Mac X Review for third-party options.
10. You’re in Too Much of a Hurry
It’s common for users to underestimate installation times for updates. Before you assume that an update has failed or is stuck, give it some time. Leave updates to run overnight and if they aren’t done by morning, that’s a good sign they have actually failed.
Reinstall macOS
If none of the above tips helped you install the latest version of macOS on your Mac, you can also try the nuclear option. macOS Recovery is a built-in feature on all Macs that lets you reinstall macOS from the system or from the internet.
To get to it, you turn off your Mac and then press the Power button to turn it on. Immediately press and hold the Command + R keys. You can also press and hold Option + Command + R (will install latest version of macOS compatible with your system) or Shift + Option + Command + R (will install the version of macOS your system came with).
If you have a newer Mac with Apple Silicon (M1, etc), then you have to press the power button and just keep holding it even after the system powers on. After a little bit, you’ll see the startup options window.
Keeping Your Mac Updated
While it’s a good idea to update your Mac, sometimes updates cause more problems than they solve! Hopefully, this article has brought you closer to knowing why you can’t update your Mac and what you can do to fix it.
