OJS-3.1.1-4 view pdf or html

When updating from OJS- to 3.1.1-4, the links to pdf or html do not appear, for example in the following address: https://nozomiscience.org/nsojs/index.php/rpn/article/view/14

Hi @jhisaza

Do they show up with other themes?
Can you look at the PHP error log for errors and fatal errors?
Was the update process successful?

Hi Vitality
The upgrade process appears to be successful.
I changed the configuration to “ON” in this debug:
; Display an error message when something goes wrong.
display_errors = On
and I got many alerts like this:
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; Smarty has a deprecated constructor in /home/pronatp/public_html/nozomiscience.org/nsojs/lib/pkp/lib/vendor/smarty/smarty/libs/Smarty.class.php on line 64

What should I do?

This is just a cosmetic warning. Do you see any errors or fatal errors there?
Have you got the access to the database to check related tables?