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Yassin Koleilat's avatar
Yassin Koleilat
Brass Contributor
Aug 29, 2025
Solved

MS Defender - Installation Error version 101.25072 on macOS

Dear experts, The latest version of MS Defender can't be installed. I'm getting an error message since release date (5th Aug). I have tested to restart the computer, tested with different networks, ...
  • BrandonJ365's avatar
    BrandonJ365
    Sep 08, 2025

    FYI...MS has this posted on their service health status page.  They have a fix in the works but sounds like it will be a "side channel" upgrade of some kind.  I'm betting we'll be having to push a shell script via MDM that will end up doing a "rip and replace" of sorts.

    https://admin.cloud.microsoft/?#/servicehealth/:/alerts/DZ1144032

mluoto's avatar
mluoto
Copper Contributor
Sep 02, 2025

According to our own research, this is caused by the Defender Tamper Protection.

Happens with both MAU and manual installation:

"version": "101.25072.0011", "severity": "E", "code":"UIStopRejected", "text":"Cannot stop Defender UI process, tamper protection in state "block"

If you set the Tamper Protection to "Audit" instead of "Block", update will go through without issues.

Of course, this isn't any way ideal solution and waiting for a proper fix, without compromising the security policies we have in place.

mg7aa's avatar
mg7aa
Copper Contributor
Sep 03, 2025

Confirmed this through some troubleshooting.  Macbook Air M2 15.6.1

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