如果您已将Windows 10升级到当前可用的最新版本，并且您非常确定不想将 Windows 回滚到较早的安装，那么您可以运行磁盘清理工具以在^{(Disk Cleanup Tool)}Windows^{(Windows Upgrade)}之后删除以前的Windows安装升级并释放磁盘空间。

删除^(Remove)以前的Windows安装

将Windows 10^{(Windows 10)}升级到较新版本后，您可以使用“磁盘清理工具”中的“^{(Disk Cleanup Tool)}删除以前的 Windows 安装^{(Remove previous Windows installations)}”选项释放数GB^(GBs)的磁盘空间。为此，请在开始搜索中键入^(Start)cleanmgr，右键单击它并选择以管理员身份运行^(Run)以在提升模式下打开磁盘清理工具^{(Disk Cleanup Tool)}。

工具打开后，向下滚动直到看到Previous Windows installation(s)。这将删除Windows.old 文件夹。选中此选项并按 OK。

系统会警告您，如果您清理了以前的Windows安装或临时^(Temporary)安装文件，您将无法再将机器 mack 恢复到以前的Windows版本。

单击是^(Yes)继续。

在那里，您可能还想删除这些升级和安装文件：

• Windows 升级日志文件^{(Windows upgrade logs files)}：这些文件包含可帮助您排除升级和安装过程故障的信息。如果您的过程顺利，您可以删除这些文件。
• Windows ESD 安装文件^{(Windows ESD installation files)}：如果您不需要重置或刷新您的 PC，您可以删除这些文件。
• 临时 Windows 安装文件^{(Temporary Windows installation files)}：这些安装文件由Windows安装程序使用，可以安全删除。

当然，如果您不这样做，Windows 10 稍后仍会运行计划任务以删除这些安装文件。

Remove previous Windows installations after a Windows 10 Upgrade

If you hаve uрgraded your Windows 10 to the latest version which is currently available, and you are very sure that you do not want to roll back windows to an earlier installation, then you may run Disk Cleanup Tool to remove previous Windows installations after the Windows Upgrade & free up disk space.

Remove previous Windows installation(s)

After upgrading Windows 10 to a newer version, you can free up several GBs of disk space by using the Remove previous Windows installations option in Disk Cleanup Tool. To do this, type cleanmgr in Start search, right-click on it and select Run as administrator to open the Disk Cleanup Tool in an elevated mode.

Once the tool opens, scroll down till you see Previous Windows installation(s). This will remove the Windows.old folder. Check this option and press on OK.

You will be warned that if you clean up the previous Windows installations or Temporary installation files, you will no longer be able to restore the machine mack to the previous version of Windows.

Click on Yes to proceed.

While there you may also want to delete these upgrade & installation files:

• Windows upgrade logs files: These files contain information that may help you troubleshoot the upgrade & installation process. If your process has gone smoothly,  you may delete these files.
• Windows ESD installation files: If you do not need to reset or refresh your PC, you may delete these files.
• Temporary Windows installation files: These installation files are used by Windows setup and they can be safely deleted.

Of course, if you do not do this, Windows 10 will still run a scheduled task later on to remove these installation files.

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