If the target computer has no internet access, follow these steps to transfer and apply the update:
To update your definitions manually, you must download the specific installer for your 64-bit architecture. Microsoft Security Intelligence Update (64-bit) File Name: Usually mpam-fe.exe or mpas-fe.exe . If the target computer has no internet access,
The "Offline Update" is often confused with the . The scan is a specialized tool that restarts your PC into a secure environment to remove persistent malware like rootkits that hide while Windows is running. Microsoft Defender Offline scan in Windows The scan is a specialized tool that restarts
the 64-bit installer on a machine with internet access. Transfer the file to a USB flash drive. After downloading, double-click the file to run it
After downloading, double-click the file to run it. No window will appear, but the update happens in the background, typically taking just a few seconds to apply. How to Install the Update on an Offline PC
the installer on the offline Windows 10 PC by double-clicking the .exe .
This guide provides the official steps and direct download links to manually update your security definitions for free. Official Download: Windows Defender Offline Update