[Problem] You can't find Windows 8.1 update in Windows 8 Store
If you can't find Windows 8.1 update listed in Windows Store, you should wait for a few hours. Since Microsoft released Windows 8.1 just a few hours back, it'll take some time to appear in all regions. So better to wait for a few hours until it appears in your country.
If you can't wait or if the update doesn't appear even after waiting for some hours, check out following steps:
- An update "KB2871389" is required to update to Windows 8.1, so make sure this update is installed in your Windows 8 system.
To check it, open Windows Update from Control Panel or Start Screen and check for new updates. If the update has not been installed in your system yet, Windows Update will automatically detect and download it.
Alternatively, you can direct download and install the update using following links:
Download KB2871389 Update for Windows 8 (32-bit)
Download KB2871389 Update for Windows 8 (64-bit)
Download KB2871389 Update for Windows Server 2012
Once the update is installed successfully in your system, repeat the above mentioned steps to upgrade to Windows 8.1 through Windows Store. Now it should work without any problem.