copy a basic mobile VR headset App

I want a copy of this app crested. I need all origination files and full control of the build. I require it only for me to use for my own business. ios or android only required so you can chose which is faster snd easier to do. i want this in case this app is not supported by the developer in the future. https://apps.apple.com/gb/app/a-walk-through-dementia/id1242267344