Testing iOS application from app center on Iphone 6 using windows

Hi guys I want to test an application which is on MS App Center. I have registered my device "iphone6" in my device section on MS App Center and also provided the UDID to developer team. Now when I go to the app center to download the application i can not see the download button. Download button invisible Can you please help me install the application on my phone so that i can test it. Devices that I have are: Hp laptop, Windows 10 and iPhone 6 software version 12.4.9