Microsoft has released a troubleshooter to help find problems that may prevent you from updating to Windows 8.1.
You can try this troubleshooter here.
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If you do not see the Windows 8.1 update in the Windows Store, here are some of the reasons. You can find more details here on why you may not be seeing the Windows 8.1 update.
a. If you’re running Windows 8.1 Preview, here’s how to update to the final version.
b. If you’re running Windows Enterprise Edition or Volume License version of Windows Pro. You must speak to your system administer to learn how to update.
If you are not sure, the following steps will help you identify if you have a Volume License version of Windows:
If it says something that resembles Volume, you won’t be able to get it through the store and will need to talk to your system administrator about their plans for rolling out this update based on the Volume License agreement through the
Volume Licensing Service Center (VLSC). If you are the system administrator or the person responsible for your company’s computers, you should refer to this article for information on how to upgrade.
c. If you’re using a Multiple Activation Product Key through a Commercial or MSDN contact. To install the update, you need to use media obtained through those programs.
If you are having issues with installing Windows Update we recommend you post for help with that issue.
You may also attempt an automated fix by running the Windows Update troubleshooter
(If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, and then click Settings.)
To refresh the catalog, try pressing the Windows and R key together to open the run box, type WSReset.exe and hit Enter. Reboot and check the Windows Store again.
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Microsoft has released a troubleshooter to help find problems that may prevent you from updating to Windows 8.1.
You can try this troubleshooter here.
I have a new Windows 8 machine and I couldn't see the 8.1 upgrade in the Store. I uninstalled update KB2871389. Rebooted and reinstalled Windows Update KB2871389. That worked and I am now downloading the Windows 8.1 upgrade from the Store app.
Thank you to all who suggested the fix,
This is what I just did and it worked like a charm .. currently downloading as we speak from the store.
Admittedly, Apples are constructed more with the preferences of the totally helpless, totally ignorant user in mind. However, even most of those users, generally small children and the drug-addled, when they are unable to solve a problem with their units (and the few Apple products I own, mostly iPods, have frequent issues), have the residual cleverness to call user support for help.
Why not try that first and see if your problem may be surmountable. Mine were. They respond quickly and pleasantly. In the USA, that support number is 877-254-4698. If you are located elsewhere, the phone number for support is listed on the web page located at http://support.microsoft.com/gp/esd-support-phone-numbers .
Sorry about the snide tone, but members of the Cult of the Applites bring it out in me.
Tried everyone and nothing is working to update it to 8.1 This is the worst thing ever created. Far worse than any apple laptop I've used. I have no choice but to return this and switch to apple. It's really upsetting because I was hooked on windows specially windows7
I managed to solve the issue by simply making sure my pc was fully up to date and when I did this the windows 8.1 showed up in my store plus a lot of other problems were solved. I didn't realise that my pc wasn't up to date until I went to settings, change pc settings then went to windows update and clicked check updates then its just the matter of installing them. I really hope this helps some of you because this was a problem that made me think of getting a new pc.