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Error: Class PDO does not exist

If you experience an error message like "Error: Class PDO does not exist" during installation of or update to LiveAgent version 4.0.43.8 or higher, then it is a reference to missing support of MySQL PDO in your webserver.

There are 2 possible solutions:
1) Have your hosting admin to install MySQL PDO extension to your webserver
2) Into accounts/settings.php file of Live Agent  place:
DB_DRIVER=Mysql

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