KB5043055: Windows Installer fixed and other bug fixes

September 10, 2024—KB5043055 (OS Build 25398.1128)

Improvements
This security update includes quality improvements. Below is a summary of the key issues that this update addresses when you install this KB. If there are new features, it lists them as well. The bold text within the brackets indicates the item or area of the change we are documenting.

• [Windows Installer] When it repairs an application, the User Account Control (UAC) does not prompt for your credentials. After you install this update, the UAC will prompt for them. Because of this, you must update your automation scripts. Application owners must add the Shield icon. It indicates that the process requires full administrator access. To turn off the UAC prompt, set the HKEY_LOCAL_MACHINE\\SOFTWARE\\Policies\\Microsoft\\Windows\\Installer\\DisableLUAInRepair registry value to 1. The changes in this update might affect automatic Windows Installer repairs; see Application Resiliency: Unlock the Hidden Features of Windows Installer.
• [BitLocker] You might not be able to decrypt a BitLocker data drive. This occurs when you move that drive from a newer version of Windows to an older version.
• [Unified Write Filter (UWF) Windows Management Instrumentation (WMI)] API calls to them to shut down or restart a system throws an access denied exception.
• [Azure Virtual Desktop] A deadlock stops you from signing in to sessions.