Windows 8 users have the ability to update to Windows 8.1 for free. However in some cases the update doesn't appear in the Windows Store. Here's how to fix this issue: You can try to clear and reset the Windows Store cache in order to view the latest content.

Open the Control Panel > Windows Update.

Learn more: https://support.microsoft.com/en-us/help/2871389/update-is-available-that-prepares-windows-8-and-windows-rt-based-compu If you are already running the preview version of Windows 8.1 read this article:* https://insider.windows.com