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If when hovering over the upgrade icon on the taskbar you get:
Your version of Windows 10 would reach the end of service soon, Click to download a newer version of Windows 10 to stay supported.
or
An unsupported version of Windows will no longer receive software updates from Windows Update. These updates include security updates that can help protect your PC from harmful viruses, spyware, and other malicious software which can steal your personal information. Windows Update also installs the latest software updates to improve the reliability of Windows—such as new drivers for your hardware.
and you are unable to perform updates then this guide is for you. There are several things you can do to fix this issue presented here, it is advisable to follow them in a way how they are presented for best performance and system safety.
Download and run Setupdiag from the official MICROSOFT website. SetupDiag is a standalone diagnostic tool that can be used to obtain details about why a Windows 10 upgrade was unsuccessful. It works by examining Windows Setup log files to determine the root cause of a failure to update or upgrade the computer. Once the scan is completed, check the generated log files. The SetupDiagResults.log will be generated and saved in the same folder where you downloaded Setupdiag. Open SetupDiagResults.log using Notepad. You may need to take a look at these folders:
If there are any issues or conditions that are blocking the upgrade, they will be listed here.
Press ⊞ WINDOWS + R to open the run dialog
In run dialog type Regedit and press ENTER
Locate: HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
Locate two DWORD files, if they do not exist, create them as:
TargetReleaseVersion
TargetReleaseVersionInfo
Set the value of TargetReleaseVersion to 1
If you are stuck on Windows 10 1909 and want to upgrade to Windows 10 20H2 now, you need to set the value for TargetReleaseVersionInfo to 20H2
Reboot the computer
Visit Microsoft.com and hit the ‘Update now’ button visible on the page
Download tool and run it
Click on Update now to start the upgrade process
“Your PC ran into a problem and needs to restart. We’re just collecting some error info, and then we’ll restart for you. (0% complete) If you’d like to know more, you can search online later for this error: 0xc000021a”This error pops up when a user-mode subsystem like the WinLogon or the Client Server Run-Time Subsystem or CSRSS has been compromised fatally and security can no longer be guaranteed in the system. Thus, the operating system switches to kernel mode, and Windows won’t be able to run without the WinLogon or the Client Server Run-Time Subsystem. This is why it’s one of the few cases where the failure of a user-mode service can shut down the system. To resolve the issue, here are some fixes that might help.
This specific Windows 8.1 or Windows 10 error code has to do with the number of times you can use your license number to install windows programs on computers. All windows activation codes are licensed to be used one time for a device, to control piracy, but what happens when your PC crashes, or you have to change a hard drive component and are forced to re-install Windows Operating System. Luckily, there is an easy fix for this issue.
Basically, when you need to re-install the Windows operating system that you have previously bought and installed on another computer an error code will be displayed with a message telling you that the activation server determined that the specific key could not be used for activation. This occurs because the key has already been used on that computer, or a different one, to install operating systems. There are a few easy fixes for this issue, and most of them should be easily completed on your own.
There aren’t many explanatory ways to repair Error Code 0xc004c008. Below are two methods to go about addressing this issue.
If the first method did not work, the only other option is to call Microsoft and walk through the process with a technician. To do this, dial “1-800-936-5700”. Explain the error that you received and the steps in the update process during which it was displayed. The technician will be able to walk through the steps from getting a new product key to finishing the installation.
If you're not a tech-savvy individual but would like to solve this problem without the aid of a technician, download a powerful automated tool to fix error code 0xc004c008.
HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows