如果您无法在^{(unable to install the latest Windows 10 version )}系统上安装最新的 Windows 10 版本，那么这篇文章可能会对您有所帮助。尽管可能有也可能没有特定于此问题的错误消息，但操作系统可能会升级失败并在系统上闪烁几次后恢复到以前的版本。通常，系统会在不升级的情况下重新启动。一些用户说它安装了一半或 75% 的更新，然后突然重新启动。

Windows 10 版本 21H2 未安装

在这种情况下，请尝试安装 Windows 更新失败^{(Windows Update fails to install)}时遵循的基本步骤。除了这些步骤之外，还可以尝试以下一些步骤：

1]删除文件夹$WINDOWS.~BT

1. 让 Windows 显示隐藏的文件和文件夹。为此，请打开文件资源管理器^{(File Explorer)}并在顶部的选项卡中选择查看^{(View )}选项卡。
2. 检查隐藏文件的选项，如下图所示。
3. 在 C: 驱动器中搜索文件夹 $ WINDOWS.~BT找到后，将其删除。

$Windows.~BT 和 $Windows.~WS 文件夹是由Windows在升级过程中创建的。如果升级失败，最好删除文件夹并重新开始升级过程。

2]重^(Rename)命名SoftwareDistribution文件

删除或重命名 SoftwareDistribution 文件夹。^{(Delete or rename the SoftwareDistribution folder.)} 如果您的Windows Update过程无法正常运行，或者您发现此文件夹的大小确实变大了，那么您可以考虑删除Software Distribution文件夹。

如果这不起作用，请尝试以下特定于功能更新的故障排除步骤。^{(It this does not work, try the following troubleshooting steps which are specific to the Feature Update.)}

1]验证硬件兼容性

检查此列表以确定您的系统是否与功能更新^{(Feature Update)}兼容：

• 宏碁^(Acer)
• 戴尔^(Dell)
• 生命值^(HP)
• 联想^(Lenovo)
• 三星^(Samsung)
• 索尼^(Sony)
• 东芝^(Toshiba)。

这篇文章解释了为什么您可能会收到此 PC消息不再支持 Windows 10 。

2]记下错误

如果您可以记下错误，这里列出了Windows 10 安装或升级错误^{(Windows 10 Installation or Upgrade Errors)}，可以帮助专门解决问题。这篇文章将帮助 IT 管理员解决 Windows 10 升级错误。

3]使用Windows 10更新助手

如果更新无法从 PC 本身运行，您可以考虑使用Windows 10 更新助手进行升级。

4]使用Windows 10安装媒体工具^{(Installation Media Tool)}升级^(Upgrade)

您可以尝试使用Windows 10 安装媒体工具^{(Windows 10 Installation Media Tool)}升级到此 功能更新^{(Feature Update)}。

5]收到 CRITICAL_PROCESS_DIED^{(Receive CRITICAL_PROCESS_DIED)}错误

如果您收到CRITICAL PROCESS DIED 错误，请参阅此帖子。

希望这里有一些东西可以帮助您升级 Windows 10。^{(Hope something here helps you upgrade your Windows 10.)}

PS：帖子已针对Windows 10 21H2 进行了更新。

Windows 10 version 21H2 Update not installing

If you are unable to install the latest Windows 10 version on your system then this post may help you. Though there may or may not be an error message specific to this issue, the OS may fail the upgrade and revert to the previous version after a few flashes on the system. Usually, the system reboots without the upgrade. Some users said that it installs half or 75% of the update and then restarts abruptly.

Windows 10 version 21H2 not installing

In such a situation, please try the basic steps which are followed when a Windows Update fails to install. Other than those steps, a few of the following could be tried as well:

1] Delete the folder $WINDOWS.~BT

1. Make Windows show Hidden files & folders. To do this, open the File Explorer and among the tabs on the top, select the View tab.
2. Check the option for hidden files as in the image below.
3. Search for the folder $WINDOWS.~BT in the C: drive. Once you find it, delete it.

The $Windows.~BT and $Windows.~WS folders are created by Windows, during the upgrade process. In the case of a failed upgrade, it is better to delete the folder and start the upgrade process afresh.

2] Rename the SoftwareDistribution file

Delete or rename the SoftwareDistribution folder. If your Windows Update process is not working properly or if you find that the size of this folder has really grown large, then you can consider deleting the Software Distribution folder.

It this does not work, try the following troubleshooting steps which are specific to the Feature Update.

1] Verify hardware compatibility

Check this list to determine if your system is compatible with the Feature Update or not:

• Acer
• Dell
• HP
• Lenovo
• Samsung
• Sony
• Toshiba.

This post explains why you may receive Windows 10 is no longer supported on this PC message.

2] Note down the error

If you can note down the error, here is a list of Windows 10 Installation or Upgrade Errors that can help troubleshoot the problem specifically. This post will help IT administrators troubleshoot Windows 10 upgrade errors.

3] Use Windows 10 Update Assistant

If the updates don’t work from the PC itself, you might consider using the Windows 10 Update Assistant to upgrade.

4] Upgrade using Windows 10 Installation Media Tool

You may try to upgrade to this Feature Update using the Windows 10 Installation Media Tool.

5] Receive CRITICAL_PROCESS_DIED error

See this post if you receive a CRITICAL PROCESS DIED error.

Hope something here helps you upgrade your Windows 10.

PS: The post has been updated for Windows 10 21H2.

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