KB5055518 was Microsoft’s April 8, 2025, security update for Windows 10 version 22H2, bringing that edition to OS build 19045.5737. The same KB also covered Windows 10 Enterprise LTSC 2021 and Windows 10 IoT Enterprise LTSC 2021, but those editions received build 19044.5737. Microsoft has since marked the update expired; it is no longer available through the Update Catalog or other release channels.
What KB5055518 covered
Microsoft released KB5055518 on April 8, 2025, as the 2025-04 B release for Windows 10 version 22H2. Microsoft’s Windows 10 release information lists version 22H2 at build 19045.5737 for this update.
The KB number also applies to two LTSC editions. Their listed build is 19044.5737, not 19045.5737.
| Windows edition | Build listed for KB5055518 |
|---|---|
| Windows 10 version 22H2 | 19045.5737 |
| Windows 10 Enterprise LTSC 2021 | 19044.5737 |
| Windows 10 IoT Enterprise LTSC 2021 | 19044.5737 |
What changed in the update
Windows 10 version 22H2
Microsoft describes the version 22H2 release as addressing security issues in the operating system. Its support article does not document additional issues for this release.
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Enterprise and IoT Enterprise LTSC 2021
For the LTSC editions, Microsoft lists several additional changes in its KB5055518 support article:
- A daylight-saving-time change for the Aysen region of Chile in 2025.
- Creation of an
inetpubfolder on the system drive as part of a security protection. - A Windows Hello facial-recognition improvement requiring color cameras to see a visible face.
These LTSC-specific items should not be treated as a list of extra changes for every Windows 10 version 22H2 device.
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Is KB5055518 still available?
No. Microsoft marks KB5055518 as expired and states that, as of March 31, 2026, it is no longer available through the Microsoft Update Catalog or other release channels. The support article recommends updating devices to the latest Windows version. An old standalone package is therefore not a current Microsoft-provided installation option.
How the known-issue notes should be read
The support article includes a Citrix Session Recording Agent issue concerning failure to complete a January 2025 security update. Microsoft describes it as observed for that January update, not as a new failure introduced by KB5055518. The noted resolution was Citrix SRA 2503, released April 28, 2025, or a newer version.
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The article also notes that a Windows Hello issue entry was later removed after Microsoft determined it did not apply to Windows 10 version 22H2 or the listed LTSC editions. That removed issue is distinct from the LTSC facial-recognition improvement described above.
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KB5055518 was released while Windows 10 was still supported. Support ended on October 14, 2025. Microsoft Support’s KB5055518 page states: “Support for Windows 10 has ended on October 14, 2025”. The update’s later expiration and Windows 10’s end of support are separate events: the first concerns availability of this particular update, while the second concerns the operating system’s support lifecycle.
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