In that case, please contact EAMCET authorities. They will ask for your details and credentials and help you out. But, it is important in some cases t get an FIR lodged stating that your hall ticket is lost (if it is actually lost). But if it is not lost, just forgotten, then please try to find it.

Hello,

I would suggest you to chekc your email inbox, email trash and the messages on your phone number.

The web page of downloading hall ticket ask for registration no. , Qualifying exam registration no. And date of birth. 

In case you have forgotten your registration no. You can contact their team at:

E-Mail: 2019apeamcet@gmail.com 

Website: https://sche.ap.gov.in/eamcet

Good luck.