What should I do if Win8.1 update is not received?

  
The first step, whether it is Win8 or Win8.1, first open Windows Update: Control Panel - System and Security - Update.
The second step, after detecting the update, Win8 users please install KB2871389, Win8.1 users please install KB2919355.
The third step, Win8.1 user installation KB2919355 is completed. After Win8 users install kB2871389, open the Windows Store, click Win8.1 update; Win8 users update is the latest Windows 8.1 Update.

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