According to Microsoft , the "C" and "D" releases are "intended to provide visibility and testing" of those fixes for IT pros and enterprise administrators. These preview releases are not installed automatically. They are visible only if you go to the Windows Update page in Settings and manually check for updates.
The only way to install one of these optional updates is to click the Download And Install Now link below its entry, as shown here:. If you leave the Windows Update page without installing that update, nothing happens. The optional update disappears the following month, when it's replaced by the regular Patch Tuesday update.
Note that as a result of the global coronavirus pandemic, Microsoft briefly suspended delivery of the "C" and "D" updates in early These updates resume in July Click the entry for any update to see further details about that update, if they're available. Follow this link for instructions on how to identify the build installed on your device and compare it to the master list of Windows 10 updates:.
Windows 10 tip: Find and decode secret version details. To review an up-to-the-minute list of updates for all currently supported Windows 10 versions, see the official Windows 10 Update History page. Use the links in the navigation pane on the left to choose a specific Windows 10 version. Windows 10 downloads cumulative updates in the background and installs them automatically. As noted earlier, optional updates released in the "C" and "D" weeks are not installed automatically. In addition, as of version , feature updates are also not installed automatically unless the current device is approaching its end-of-support date.
Using options on the Windows Update page in Settings, you can specify Active Hours a block of up to 18 continuous hours when you don't want to be interrupted by these installations. In theory, that prevents a large update from interfering with your workday activities, although the strategy fails if you shut your device down at the end of the day and don't restart until the next day.
Windows 10 offers additional notification options as well as the option to choose a specific time during your lunch break, for example when updates will be installed. As of version , Windows 10 no longer installs feature updates automatically.
Instead, as with the optional cumulative updates delivered in the "C" and "D" weeks, the update is listed as available in Windows Update, but you have to click Download And Install to kick off the installation.
This change affects all editions, including Windows 10 Home. If you choose not to click that link, Windows 10 will respect your decision, but not indefinitely. For retail editions of Windows Home and Pro , each version is supported for 18 months from its initial release date.
When you approach the end of that period, Windows Update will notify you that it plan to install an upgrade to the current version; you can choose the installation time within a narrow range of dates, but you can't delay the installation indefinitely.
If you're running a version of Windows 10 Home earlier than version , there is no supported way to delay the installation of cumulative updates, and when a feature update is available, it will install in the next window outside Active Hours. You can try various workarounds, such as shutting off the Windows Update service or setting your network connection as metered, but these only briefly postpone the inevitable.
As of version , all publicly released non-Insider editions of Windows 10 allow users to pause all updates. The option to pause for 7 days is available on the main Windows Update page in all editions. In business editions Pro, Enterprise, Education , you can use the Advanced Options button to choose a specific date up to 35 days in the future.
For full details about this feature, see "Windows 10 tip: When you should and shouldn't pause updates. In Pro, Enterprise, and Education editions, you can defer feature updates for up to days after their initial release. In addition, you can defer quality updates, including the monthly Patch Tuesday fixes, by up to 30 days.
As of version , those deferral options must be set using the Local Group Policy Editor. Update deferrals use the Windows Update for Business feature set. There are three known issues in this update, including one in which devices with Windows installations created from custom offline media or custom ISO image might have Microsoft Edge Legacy removed by this update, but not automatically replaced by the new Microsoft Edge.
It also fixes a bug that prevented some applications, such as Microsoft Office and Adobe Reader, from opening or caused them to stop responding. There are two known issues in this update, including one in which devices with Windows installations created from custom offline media or a custom ISO image might have Microsoft Edge Legacy removed by this update, but not automatically replaced by the new Microsoft Edge.
This build fixes a small number of bugs, including one in which applications such as Microsoft Outlook suddenly stopped working during normal use, and another that caused blurry News and Interests icons with certain screen resolutions. It also fixes a bug that caused PowerShell to create an infinite number of child directories.
The issue occurred when you used the PowerShell Move-Item command to move a directory to one of its children. As a result, the volume filled up and the system stopped responding. There are two known issues in this update, including one in which devices with Windows installations created from custom offline media or custom ISO image might have Microsoft Edge Legacy removed by this update, but not automatically replaced by the new Microsoft Edge.
The build also includes more than 1, new mobile device management MDM policies. With them, you can configure policies that Group Policies also support. There are several known issues in this update, including one in which devices with Windows installations created from custom offline media or custom ISO images might have Microsoft Edge Legacy removed by this update, but not automatically replaced by the new Microsoft Edge.
This build changes the default privilege requirement for installing drivers when using Point and Print. After installing this update, you must have administrative privileges to install drivers. The build also makes quality improvements to the servicing stack, which is the component that installs Windows updates. There are several known issues in this update, including one in which devices with Windows installations created from custom offline media or custom ISO image might have Microsoft Edge Legacy removed by this update, but not automatically replaced by the new Microsoft Edge.
This build fixes a wide variety of bugs, including one that caused the File Explorer window to lose focus when mapping a network drive, another that failed to detect internet connectivity when connected to a VPN, and another that caused System Integrity to leak memory.
There are several known issues in this update, including one in which devices with Windows installations created from custom offline media or a custom ISO image might have Microsoft Edge Legacy removed by this update, but not automatically replaced by the new Microsoft Edge. This build fixes several bugs, including one that made it difficult to print to a variety of printers, primarily USB receipt or label printers.
This out-of-band build fixes a bug that may prevent you from opening PDFs using Internet Explorer 11 or apps that use the bit version of the WebBrowser control. You might need to enter the characters manually. This build addresses about three dozen bugs, including one in which signing in using a PIN fails, and another that might cause a VPN to fail after renewing a user auto-enrolled certificate. It also removes Adobe Flash from your PC and makes improvements to the servicing stack, the component that installs Windows updates.
This out-of-band build fixes a bug that might redirect you to the Microsoft Store page for Gaming Services when you try to install or start an Xbox Game Pass game on your Windows 10 device. Additionally, you might receive error 0xD26 or 0xF. For more information, see KB In addition, the build makes improvements to the servicing stack, the component that installs Windows updates.
This build includes improvements to the servicing stack, which is the component that installs Windows updates. It also includes changes for verifying user names and passwords and for storing and managing files. There are several known issues in this update, including one in which system and user certificates might be lost when updating a device from Windows 10 version or later to a later version of Windows Devices using Windows Update for Business or that connect directly to Windows Update are not impacted.
This build adds the Open on hover option which is checked by default to the News and interests menu. To access it, right-click a blank space on the Windows taskbar and open the News and interests menu. In addition, it makes quality improvements to the servicing stack, which is the component that installs Windows updates.
It also includes a wide variety of small bug fixes, including one that displayed items on the desktop after they have been deleted from the desktop, and another that caused configuration problems with devices that were configured using mobile device management MDM RestrictedGroups , LocalUsersAndGroups , or UserRights policies. Get more info about KB Preview. This is a relatively minor update, but it does have a few new features.
Check for updates. If a feature update is available for your device, it will appear separately on the Windows Update page. To install it, select Download and install now. Make sure that your device is connected to the internet. Downloading updates requires an internet connection. Run the Windows Update Troubleshooter. Under Most frequent , select Windows Update.
If the Troubleshooter doesn't fix the problem, see Troubleshoot problems updating Windows or Fix Windows Update errors. The time required to download updates primarily depends on internet connection speed, network settings, and update size.
Make sure your device is plugged in and connected to the internet to download updates faster. Here's how to temporarily pause updates from being downloaded and installed.
Note that after the pause limit is reached, you'll need to install the latest updates before you can pause updates again. Next to Pause updates , select the pause length you prefer.
To finish installing an update, your device will need to restart. Windows will try to restart your device when you're not using it.
If it can't, you'll be asked to schedule the restart for a more convenient time. Or, you can schedule anytime by following these steps:. Select Schedule the restart and choose a time that's convenient for you. You can set active hours to make sure automatic restarts for updates only happen when you're not using your device. Get updates when you're away from your PC with active hours in Windows.
For more tips on freeing up disk space, see Free up drive space in Windows. This way, if updates are installed outside active hours, your device will have enough power to complete the installation.
An update history is available so you can see which updates were installed, and when. You can also use this list to remove specific updates, although we don't recommend this unless it's necessary. View update history. However, if you must remove an update, you can do so in update history.
Feature updates are typically released twice per year and include new functionality and capabilities as well as potential fixes and security updates. Quality updates are more frequent and mainly include small fixes and security updates. Windows is designed to deliver both kinds of updates to devices through Windows Update. To find which version of Windows you're running, see Which version of Windows operating system am I running? Reserved storage will be turned on for new devices with Windows 11 preinstalled, or devices on which a clean install of Windows 11 was performed.
In Windows 10, you decide when and how to get the latest updates to keep your device running smoothly and securely. If other questions come up when you update Windows 10, here are some other areas that might interest you:.
Get started with Windows When you only want info about updating Windows 10, you'll find answers to many of your questions here:.
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