August 17, 2019—KB4517276 (OS Build 10240.18308)

Applies to: Windows 10

Improvements and fixes


This non-security update includes quality improvements. Key changes include:

  •  Addresses an issue that may cause the following to stop responding:
  • Applications that were made using Visual Basic 6 (VB6).
  • Macros that use Visual Basic for Applications (VBA).
  • Scripts or apps that use Visual Basic Scripting Edition (VBScript).

You may also receive an "Invalid procedure call” error.

If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.

Known issues in this update


Symptom Workaround
Certain operations, such as rename, that you perform on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error, “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that doesn’t have administrator privilege.

Do one of the following:

  • Perform the operation from a process that has administrator privilege.
  • Perform the operation from a node that doesn’t have CSV ownership.
Microsoft is working on a resolution and will provide an update in an upcoming release.

How to get this update


Before installing this update

Microsoft strongly recommends that you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU and applying Microsoft security fixes. For more information, see Servicing stack updates.

If you are using Windows Update, the latest SSU (KB4509090) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.

Install this update

Release Channel Available Next Step
Windows Update and Microsoft Update Yes  Go to Settings > Update & Security > Windows Update and select Check for updates.
Microsoft Update Catalog Yes To get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS) Yes

This update will automatically synchronize with WSUS if you configure Products and Classifications as follows:

Product: Windows 10

Classification: Update

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4517276