You should also ask your provider to contact Installatron makers and inform them.
One thing of which you should be aware ... Installatron creates a moodledata directory inside the moodle code and uses hidden ... check your config.php file for path to moodledata and you should see something like .safowfnvasasedata ... see the 'dot' in front?
I mention that to avoid confusion should you decide to use documented methods of upgrading your moodle code. Since you have terminal and git, the best way is really via command line and git.
Matter of fact, you might also do this:
Click terminal and at the prompt in the terminal screen, type:
uname -an [ENTER]
That's shows what operating system running.
To exit terminal, type: exit [ENTER]
Also remind you to check all addons for compatibility ... if using a theme other than boost or classic. Moodle's environment check checks only core ... not addons. Ditto for Installatron.
https://moodle.org/plugins/
https://moodle.org/plugins/browse.php?list=category&id=3
'SoS', Ken