Forum Discussion
MS Defender - Installation Error version 101.25072 on macOS
- 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
UPDATE: Microsoft has published the fix. As near as I can tell, it involves pushing out an MDM profile to enable a tamper protection exclusion only for a special "upgrade helper" package Microsoft has provided. You then push out the pkg which sets tamper protection to audit mode, upgrades Defender, then turns tamper protection back on. Instructions and the helper package are found in the below link, which was published in the service health alert linked above.
https://github.com/microsoft/mdatp-xplat/tree/master/macos/upgrade_from_2506_helper
Issue is still persistent. MBP M1 15.6.1.
Tried updating manually via terminal mdatp definitions update and reopened Auto-Update - Task and Error stays. Atleast definitions are up-to-date