Can't login to Acrobat Reader DC on macOS El Capitan

Hi! 

I'm having this problem since the first days of february, and it is a very important one for me, I really need to get this solved in any way. I use macOS El Capitan, version 10.11.6, and Adobe Acrobat Reader DC version 2019.010.20099.

I try to login to Adobe Account in my Reader program, and the login page appears like below. Seems normal, but I just can't click on anything: I can't type my e-mail, and there is no option to log in from other ways such as Facebook, Google or Apple.

I really need to use the Document Cloud, can someone help me, please?

Thanks!