The app is now unsupported and no longer available for download. If it works on the latest apple shiny then great... but we don't support and upgrade it anymore. Maybe down the road it comes back. Ideally it would be a full on custom coded app and not a rebranding of tapatalk. Something that adds true value towards the user experience not otherwise archived.
Tapatalk we support but we are no longer fans of what direction the tapatalk team is taking. Its a middleman towards RDC that collects content and personal data. Instead we put more effort into making the site work natively on your web browser on as many mobile platforms as possible.
Personally I think "apps" are overrated and often the plain website gets the job done as good or better.