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[GH-ISSUE #1188] Warning to use KMS38 to MAS tools #818
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Originally created by @orbit-system on GitHub (Dec 4, 2025).
Original GitHub issue: https://github.com/massgravel/Microsoft-Activation-Scripts/issues/1188
Microsoft has announced that it has patched a security hole that many people have been exploiting to activate Windows and Office without a valid license for a long time.
Accordingly, the popular “after-the-fact” Windows and Office activation tool KMS38, developed by the Massgrave development team, has been disabled after the Patch Tuesday update released by Microsoft this month. The development team determined that this activation method is no longer valid.
Windows and Office computer users have been repeatedly stuck on the blue screen and unable to enter the operating system.
KMS38 is no longer working, Windows and Office users should avoid installing the November 2025 update
KMS38 is an open source tool that was once considered one of the most popular ways to activate unlicensed Windows and Office. This tool allows users to fully install official updates of legitimate updates without paying a fee. For years, KMS38 has been circulating widely on forums, pirate sites, and GitHub clones, attracting a whole community of users who are well-versed in the new stuff. The minimal install is still hosted on Microsoft’s two-sided Azure DevOps and GitHub platforms.
After the patch, computers that had previously activated with KMS38 were disabled and displayed a message asking them to purchase a legitimate license from Microsoft or an authorized reseller.
Microsoft is strong with Windows
Microsoft’s blocking of KMS38 has received mixed reviews. Some experts say it is a necessary step to protect users from malware, but many emphasize that KMS38 is open source and fully auditable for safety. Testing from reputable tech sites also confirms the tool works as advertised.
Massgrave’s log update says the KMS activation option has been removed. The team recommends that users switch to the HWID or Tsforge method, which still works normally, and hopes to find a way to bypass the block in the future.
The move comes just weeks after Microsoft blocked all methods of installing Windows 11 without an account, signaling that the company is taking a more aggressive stance against piracy.