I downloaded a full version of 1.7.7.3 and uploaded it as per instructions at https://devdocs.prestashop.com/1.7/basics/keeping-up-to-date/upgrade
After the files were uploaded I went to 4x4direct.co.za/install/upgrade/upgrade.php
At first I just got a blank screen
After ten minutes I refreshed, then I got a server500 time out screen
I refreshed again then got a message showing <action result="error" id="28"/>
Refreshed again then got blank screen and the next 5 refreshes the same, a blank screen.
So it seems like the DB is not updating.
I also tried to upgrade in December and it also failed. I then gave up and left it until I tried again tonight just to have another fail.
Error log shows this
4425#0: *782030 FastCGI sent in stderr: "PHP message: PHP Fatal error: require(): Failed opening required '/var/www/vhosts/4x4direct.co.za/httpdocs/var/cache/prod/ContainerRpmtwpq/removed-ids.php' (include_path='/var/www/vhosts/4x4direct.co.za/httpdocs/vendor/pear/pear_exception:/var/www/vhosts/4x4direct.co.za/httpdocs/vendor/pear/console_getopt:/var/www/vhosts/4x4direct.co.za/httpdocs/vendor/pear/pear-core-minimal/src:/var/www/vhosts/4x4direct.co.za/httpdocs/vendor/pear/archive_tar:.:/usr/share/pear/:/var/www/vhosts/4x4direct.co.za/:/tmp/') in /var/www/vhosts/4x4direct.co.za/httpdocs/var/cache/prod/ContainerRpmtwpq/appProdProjectContainer.php on line 2197" while reading response header from upstream