2026-01-28 Wednesday - RESOLVED - Possible Corrupted Download - Windows Malicious Software Removal Tool 64-bit

I first noticed this issue on 2026-01-07, Wednesday. 

My original LinkedIn post, alerting Microsoft to the issue: 

https://www.linkedin.com/posts/activity-7414853161020055552-HGbj

Note:

• Expected: 
• Version: 5.138
•  Filename: Windows-KB890830-x64-V5.138.exe
• Actual: 
•  Version: 5.137 (?)
• Filename: Windows-KB890830-x64-V5.137.exe.exe

I reported this to Microsoft on or about 2026-01-16, Friday.

Today (2026-01-28, Wednesday) - the problem still had not been corrected. 

So, I escalated (yet again) 

 

https://www.microsoft.com/en-us/download/details.aspx?id=9905  

 This is complete asshatery. 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

2026-01-28 13:30 Wedneday UPDATE: 

 As of approximately 13:30 (Central Time) 

After I escalated (yet again) - it has now been resolved. 

[Thank You to Jason Geffner (Principal Security Engineer, Senior Director, Microsoft) for his assistance in getting this communicated to the proper team]

Folks who may have assisted? 

Simon Christiansen, Principal Software Development Engineer, Defender for Endpoint at Microsoft