The Oculus App has added security for your protection, but rest assured, all the experiences we offer are checked thoroughly to ensure they are safe for everyone to use.
You will have to enable apps from unknown sources. Please follow the steps below to do so.
Step 1: Click the Gear in the upper right
Step 2: Click Settings
Step 3: Click General
Step 4: Click the slider for Unknown Sources
Step 5: Click Allow
Step 6: You should now see a check mark. You should be able to run all ImagineVR apps.