This tutorial describes how to fix the "Windows KB4474419 update must be installed" error that occurs when mounting backup images generated by Hasleo Backup Suite Free. The main contents are as follows:
Stand Alone security update KB4474419 released to introduce SHA-2 code signing support to Windows 7, Windows Vista, Windows Server 2008, and Windows Server 2008 R2. These older systems originally used SHA-1 for code signing. However, since Microsoft stopped the issuance of SHA-1 code signing in 2019, newly developed drivers can only be signed with SHA-2. KB4474419 was released to address this compatibility problem, enabling these older systems to utilize modern drivers.
The backup image mount drivers for Hasleo Backup Suite use SHA-2 code signing, which is not supported on Windows 7 and earlier operating systems without installing the KB4474419 update. If KB4474419 is not installed, attempts to mount an image will fail with the error: "The Windows KB4474419 update must be installed to mount image files in Windows 7 and earlier Windows operating systems."

Step 1. Download Windows KB4474419 update. Here is the official download link:
Please note that Windows Vista users should install the KB4474419 update for Windows Server 2008.
Step 2. Double-click the downloaded .msu file to start installing Windows KB4474419 update and follow the prompts to complete the installation.

Step 3. After completing the installation of Windows KB4474419 update, you will be able to successfully mount file backup images.

This tutorial describes how to fix the "The Windows KB4474419 update must be installed to mount image files in Windows 7 and earlier Windows operating systems." error when using Hasleo Backup Suite to mount the backup image files.