That information can be found here:
If you own a Kindle, and connect it wirelessly, this will work for you:
https://www.amazon.com/Mike-Fara-Windows-Forums/dp/B00FI62HIY/
If you own a Android (Google) based phone, this will work for you:
https://play.google.com/store/apps/details?id=com.vbulletin.build_750
The iOS version of the app is currently offline.
There is now a PWA version of the app on the Microsoft Store:
https://apps.microsoft.com/detail/9ncrsgrh8v46
We have transitioned to...