Install Module is now missing

Hello guys,

Before I publish my site in a server, there is Install Module. When I published it online, yes there was ”Install Module” at path. But when I disabled the ”Update Manager” Module, the ”Install Module” went missing. And when I turned on the ”Update Manager” again, ”Install Module” is still missing. I also edit my settings.php but no changes happened.

So, here are my settings:

Update Manager: ON

In settings.php
$conf[‘allow_authorize_operations’] = TRUE;

I’m using AWS EC2 Ubuntu 14.04 and Drupal 7

Drupal version: