This didn't work on my machine, the first step didn't work either.
How to Disable “Update to Windows 8.1 for Free” Notification in Windows 8 Store?
Description
If you are tired of seeing “Update to Windows 8.1 for Free” notification then it’s time to disable it. Get rid of these regular prompts to upgrade to Windows 8.1 for free.

Solution:
There are two ways to disable "Update to Windows 8.1 for Free" notification message in Windows 8:
Method 1: Using Group Policy Editor (gpedit.msc)
- Press “WIN+R” keys together to launch RUN dialog box and type “gpedit.msc.” Then press “Enter.”
- “Group Policy Editor” gets open.
- Go to:
Computer Configuration -> Administrative Templates -> Windows Components -> Store
- On the right-side pane, double-click “Turn off the offer to update to the latest version of Windows" option and set its value to "Enabled".

It will disable the Windows 8.1 free update installation notifications.
Method 2: Using Registry Editor (regedit)
You can do the same thing using Registry Editor instead of Group Policy Editor. Follow the below steps:
- Launch RUN dialog box by pressing “WIN+R” and type “regedit” and press “Enter”.
- “Registry Editor” gets open.
- Go to the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsStore
If you don’t find the above key then create it manually.
- Choose “WindowsStore” key and in right-side pane, create a new DWORD DisableOSUpgrade and set its value to 1.

5. Now, close “Registry Editor” and log off or restart Windows.
Congrats, you have successfully disabled those notifications
Windows for home | Previous Windows versions | Microsoft Store
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Anonymous
2014-08-08T13:38:52+00:00 -
Anonymous
2014-08-11T15:31:37+00:00 Why on earth would you not update to 8.1? This service pack is incredible. Windows 8.1 uses half the memory of Windows 8.0 on identical hardware, runs significantly faster, and addresses the years of feedback/complaints and performance issues since Windows 8.0 first came out in 2012. I couldn't imagine saying no to years worth of updates. That's like still running Windows 7 without SP2!
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Anonymous
2014-08-16T03:03:00+00:00 How does this answer my question?
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Anonymous
2014-08-16T03:08:34+00:00 gpedit.msc can not be found by windows on my machine and the registry editor doesn't have WindowsStore listed. I tried to create it manually but evidently it didn't work. How else can I get into the goup editor?