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Acting on advice from the Insider Team that I should be able to install the. But it did not “see” the two problem KBs until I resumed updates in WU. It was happy to download and install the Defender updates for me. Just for grins, I tried out the old Windows Update MiniTool (WUMT) on my stuck test machines. So while they’re still stuck for 21364, I’ll use this web page to update daily just to be safe… Note Added 6 Hours Later

That’s why I’m glad I’ve now learned how to manually download and install signatures to keep safe, even when updates gets stuck, as they sometime do. That is, when they acknowledge something is broken and promise to fix it “soon.” And to the Insider Team’s credit most such fixes come sooner rather than later.īut I can’t accept an inability to update Defender on my test machines, where’s its my only anti-malware defense. I’ve also learned it’s essential to be patient when MS goes into “break-fix” mode. When update trouble rears its head on Insider Previews, I’ve learned to cope. It’s too stealthy for my sensibilities, but it does work. The only way to tell it worked is to check the timestamp for Last Update in Windows Security → Virus & threat protection under the “Virus & threat protection settings.” After you run this program, you’ll see a timestamp that reflects a the recent past. That holds, even if you run the program as administrator. If you run this program it will (a) update your Defender signatures, but (b) provide no interaction or feedback. If you scroll down this page, you’ll find a section entitled “Manually Download the Update.” Follow the link that matches your Windows 10 version and you’ll download a program named mpam-fe.exe. I provide its URL because it’s more informative than that title. Relief is available from the “Latest Security Intelligence…” MS Security Intelligence web page for Defender. Thus: Defender Update Download Circumvents Stuck 21364 For the record neither the Update Troubleshooter, nor the TenForums WU Reset batch file worked, either. This time, apparently update downloads are well and truly stuck. Then I tried to download a new set (that failed). First, I cleared the Defender signatures (that worked). Shoot! I even tried the command line program MpCmdRun.exe. It explains further it “can’t check for definition updates” (see lead-in graphic). Next, you can forcibly get Defender to update by clicking “Protection updates” under “Virus & threat protection updates.” Not this time! This mostly-infallible workaround throws an “update failed” error. Normally, you can simply open the Windows Security item in Settings → Windows Update. That’s how I learned that a Defender update download circumvents stuck 21364. I’ve already described how KB 5001030 and KB5003397 aren’t working on my test machines. It’s been a struggle to get the latest Dev Channel Insider Build updated lately.