This installed version 4.8 of Microsoft Security Essentials.
By applying similar changes that were done when we installed it, including setting the compatibility mode to Windows 7 and running the executable with the /disableoslimit flag, we can successfully update Microsoft Security Essentials when newer updates become available through Windows update that are not yet available for download through the Windows website.
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Under Compatibility mode, tick the “Run this program in compatibility mode for:” box and then select Windows 7 from the drop down menu, then click OK.
Now open command prompt as administrator and execute the file with the /disableoslimit flag on the end as shown below.
In order to install the update, we need to run it manually with these customizations in place.
Windows update stores its downloaded update files in the C:\Windows\Software Distribution\Download folder with different hashes for the file names.At this point we can go back to Windows update and run a check for updates, which should now no longer list the update as available, as it is now installed.As Microsoft Security Essentials is not officially supported in Windows Server 2012 R2, we should expect strange and unexpected behaviour such as Windows updates failing to update it.Assuming you selected the correct file from the Windows update folder, you should be greeted with the Microsoft Security Essentials upgrade wizard as shown below, simply click the Upgrade button to proceed.Once the upgrade has completed, click the finish button to complete the process.To verify the status MSE: Open Microsoft Security Essentials, click Update, and then see the virus and anti-malware definitions status.