Same problem here.
Clicking Submit in install.php leads to a blank page with Secretary header, attempt to login after that shouts "Sorry, that login information does not exist! Please try again."
Tested Chrome 49 and IE 11. Database (MySql 5.1.41) is filled with content (no user is created though), so connection to DB works. site.php is created too and config.inc.php is updated as well.
Noticed I was still running PHP 5.4, switched to 5.6 and problem still there.
I looked into the database, nothing was created in the "users" table after install. I entered the user info manually from within phpMyAdmin, but still the same error comes when trying to login.
MySQL version: 5.5
PHP version: 7.3
I just entered it in plain text (knowing this wouldn't be right), just to see whether the output would be any different (i.e. "wrong password"). Not sure if the error messages are differentiated like this or if it would always read "login information does not exist"...