If your computer cannot connect to the internet to update via the MSE interface, you can "side-load" the update using these steps:
This is the most reliable source for manual updates. You can download the latest definitions for MSE (32-bit) directly from the Microsoft Security Intelligence page. If your computer cannot connect to the internet
Look for a file named mpam-fe.exe (this is the standard naming convention for 32-bit antimalware definitions). If your computer cannot connect to the internet