The official answer win8.1 official version update related issues

  
Many users like to explore the functions of the new system, but in the official version of the win8.1 system that is freely pushed in the win8 system, many users can't find it in the app store. What is going on? Look at the official answer for us.
If your computer is currently running Windows 8 (or Windows RT) and you want to update to Windows 8.1 (or Windows RT 8.1), in most cases, you will see free updates in the prominent location of the Windows Store home page. If the app store is open but you don't see the update, it may be caused by one of the following reasons:
1. You may need the latest updates from Windows Updates
Although Windows 8.1 updates have been downloaded and installed from the app store, Your computer will also need another update, "KB KB 2871389", and the app store will provide you with windows 8.1.
If you use Windows Update to get automatic updates, KB 2871389 will be downloaded and installed automatically.
If you have turned off automatic updates, or if you use a new computer that has not yet downloaded automatic updates, or if you don't want to wait for Windows updates to do this automatically, you can go to Windows Update and manually install KB 2871389.
1, steps to install the required updates
1 Open Windows Update by following the steps below: Swipe in from the right edge of the screen (or, if you are using a mouse, point to the lower right corner of the screen, then the mouse pointer Move up), tap or click “Set”,“Change PC settings” and “Update & Restore”.
2 Click or click “Check Now” and wait for Windows to find the latest updates for your computer.
3 If you find an update, click or click “View Details”.
4 In the list of available updates, select “KB 2871389”, and any other updates you want to install, then click or click “Install”.
5 Read and accept the license terms, then click or click “Complete> (if the selected update requires this).
2, pay attention to
• It may be necessary to restart the computer to complete the installation of some updates. Please save and close all files and apps before restarting to avoid losing any data.
After installing KB 2871389 and restarting your computer, go to the “Start” screen, click or click “app store”, then look for windows8.1 update.
Second, the Windows 8 version you are running may not support free updates from the app store.
Some versions of Windows 8 do not support free updates to Windows 8.1. These versions include:
• windows8 Enterprise Edition
• Enterprise Windows 8 Professional Edition with KMS Activation
• Windows 8 version installed with MSDN ISO and activated with Volume Activation Key
If running One of these versions is not available for free updates from the app store to windows 8.1 or windows tar 8.1.
If you install Windows 8 using MSDN ISO, you may be able to install windows 8.1 using a similar ISO in MSDN. Otherwise, you can perform a fresh installation.
The official answer for everyone, I believe you have already understood why you can not find the official version of win8.1 in your win8 system, in the above operation, you can also successfully find win8.1 updated.

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