There are actually pre-reqs to being able to install the Windows 8.1 update and also even being able to see it in your Store.
Firstly, you have to have a compatible operating system, below are the exceptions that will not be able to upgrade from the store:
- Windows 8 Enterprise
- Editions of Windows 8 Pro that are installed by enterprises using KMS activation
- Editions of Windows 8 that are installed using an MSDN ISO, and activated using multiple activation keys
If you’re running one of these editions, you can’t install the free update to Windows 8.1 or Windows RT 8.1 from the Store.
If you installed Windows 8 using an MSDN ISO, you might be able to install Windows 8.1 using a similar ISO from MSDN.
Secondly, you need to have the following Windows Update installed on your machine:
If you have this update and you have a compatible version of Windows 8, then you should just click your store icon and update!
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