WGA is a pain in the butt for many of us. Even if we have a legal copy of windows it just makes us do things we don’t want to. So here is a solution for all you WGA haters out there :

1. Download Orca (Mirror) (remember to disable your pop-up blocker when on that page) and install it.
2. Open WindowsDefender.msi with Orca
3. Go to the “CustomAction” table on the left
4. Right-click on the “CHECK_WGA” action and select “Drop Row”
5. Now got to “Dialog” table on the left
6. Look for the dialog “CheckWGA”, change the Attribute from 2 to 0
7. File > Save (DO NOT use Save As…)
8. Close Orca and run the installer.

The new Windows Defender is out, the way to bypass the WGA check (at least the one I found) is to open the MSI with Orca. Click Control Event on the left and go to CheckWGA. Make sure that the Argument column of the first and second CheckWGA Dialogs is “LicenseAgreement” and you can install and use Windows Defender without problems.