Who will help to understand the error when updating Virtuemart 2 - 3?

Question

Joomla

The error itself is: Fatal error: require_once(): Failed opening required '/administrator/components/com_virtuemart/liveupdate/liveupdate.php' (include_path='.:/usr/share/php') in code/administrator/com_virtuemart/helpers/ adminui.php on line 91
Here is line #91
require_once JPATH_VM_ADMINISTRATOR.DS.'liveupdate'.DS.'liveupdate.php';

Answer 1

The adminui.php file states that another liveupdate.php file is required for this script to work. There is no such file at the specified path, so it throws out a fatal error.
And what exactly is happening, it is impossible to say in the absence of the necessary information:
1) Version of Joomla;
2) Specific version of VirtueMart 2 before update;
3) How do you update and what version of VirtueMart 3 are you updating to;
4) When does the said error occur? During the update, after the update?..