About this osTicket Installation:
Server Information
osTicket Version: v1.10.6 (91602a7) — Up to date
Web Server Software: Apache/2.4.18 (Ubuntu)
MySQL Version: 5.7.26
PHP Version: 7.0.33-0ubuntu0.16.04.5
Installed PHP Extensions
gdlib: Used for image manipulation and PDF printing
imap: Used for email fetching
xml: XML API
xml-dom: Used for HTML email processing
json: Improves performance creating and processing JSON
mbstring: Highly recommended for non western european language content
phar: Highly recommended for plugins and language packs
intl: Highly recommended for non western european language content
fileinfo: Used to detect file types for uploads
Zend Opcache: Improves overall performance
PHP Settings
cgi.fix_pathinfo: Not configured
date.timezone: Not configured
Database Information and Usage
Space used: 98.23MiB
Timezone: UTC
Installed Language Packs
English (United States): en_US — include/i18n/en_US
Problems
I'd like to preface this by saying that I'm taking over this installation from a previous member of staff, so may not be aware of how certain things are set up.
The way I did the upgrade was by copying the contents over the existing installation directory, then overwriting our backed up config file to include/ost-config.php. Then I corrected the permissions to all the files and folders there and loaded up the OSTicket page, and saw that in the information table it showed the latest version.
When following instructions to upgrade to the latest stable release (v1.10 to v.1.10.6), I managed to get everything set up correctly to where I now have OSTicket up and running on 1.10.6. Looking at the dashboard however, I do not have an "Upgrader" tab though (screenshot attached - Dashboard.png). I just have "System Logs" and "Information". My account is set to the Admins Role (not sure if that is built in) and I'm not seeing any rights there which I don't have.

So my question for this problem is:
Is the Upgrader tab supposedly disabled/set to be hidden somewhere in a config file? I couldn't find anything obvious.
Despite the link to the Upgrader not being present, I can still access the Upgrader page by manually entering the page name in the URL (./upgrade.php). It's stating that there are errors with my PHP, MySQL and MySQLi extension for PHP prerequisites are too low and need upgrading. However, the versions installed are higher than what's being recommended by the page. Clicking the "Start Upgrade Now" button just brings up the message "Nothing to do! System already upgraded to v1.10.6 with no pending patches to apply." (screenshot attached - Upgrader.png). From my understanding, the "Start Upgrade Now" button kicks off some scripts which involves database optimisation and such, so not having these run will likely present issues later.

So my questions for this problem are:
- How do I fix the 3 errors shown in the screenshot?
- How do I kick off whatever scripts run with the "Start Upgrade Now" button?
Please let me know if more information is needed.
Edit: Fixed formatting