If getting the UltraFlix app continues to be problematic ... consider sending your details to the company.

https://ntek.com/contact/

OR here is another possible option in order to get assistance ... give a shot at opening a ticket via this "Support Ticket" system ...

https://ntek.com/osticket/

You get to the above "Support Center" by selecting 'Contact' at the bottom of the UltraFlix support page ...

https://ultraflix.com/support.php