If you’re running Windows 8.1 or Windows RT 8.1 and you don’t have the update yet, you can manually check for and install the update by following these steps:

  1. Make sure your PC is plugged in and connected to the Internet using a non-metered connection. Don’t disconnect, unplug, or turn off your PC while the update is being installed.
  2. Swipe in from the right edge of the screen, tap Settings, and then tap Change PC settings. 
    (If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, click Settings, and then click Change PC settings.)
  3. Tap or click Update and recovery, and then tap or click Windows Update.
  4. Tap or click Check now.
  5. If updates are found, tap or click View details.
  6. In the list of updates, select the update containing KB 2919355, and then tap or click Install.
    If you're prompted for an administrator password or confirmation, enter the password or provide confirmation.
  7. After the installation is complete, restart your PC and sign in.


  • If you don’t see KB 2919355 in the list of available updates, you might be missing one or more required updates. Follow the previous steps to check for updates, install all important updates, particularly KB 2919442, restart your PC, and then check for KB 2919355 again.

Why you should install this update

We strongly recommend that you install Windows 8.1 Update or Windows RT 8.1 Update (KB 2919355). This is a critical update that is required for future updates to Windows. If you prevent it from installing or you uninstall it, you won’t get future bug fixes, security updates, and new features. In some cases, if you uninstall this update from a new PC after signing in with a Microsoft account, OneDrive might not work as expected.

How much drive space you need to install the update

In most cases, you'll need the following amount of available drive space on your PC to download and install the Windows 8.1 Update or Windows RT 8.1 Update (KB 2919355) from Windows Update, depending on your version of Windows:
  • Windows 8.1 (64-bit version): 2 GB
  • Windows 8.1 (32-bit version): 0.8 GB
  • Windows RT 8.1: 1.1 GB
or download the manual update software here here


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