Enabling Unknown Sources
While you're developing your Unreal Engine 4 (UE4) Virtual Reality (VR) project, it's best to enable allow Unknown Sources so you can run your application without having to have it be registered or reviewed by Oculus. To enable the Unknown Sources option, you will need to do the following:
Open the Oculus Store then click on the Gear icon that is in the upper right-hand corner to expose the Settings menu option, then click on the word Settings.
From the left-hand side, select the General section. Then in the Unknown Sources section, click on the button to enable this option.
After the button has been clicked on, a message will be displayed. Click on the Allow button to continue.
When completed, the button will turn blue like in the following image.
To revert this change back to the default settings, click on the button again and the checkmark will change from a checkmark back into an X.