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Missing or invalid config.php

You tried to run the upgrade process but a valid config.php is missing.

If you've lost your config.php file when replacing the Gallery 2 files in the preparation for this upgrade, please restore it and try again.
If you actually want to run the Gallery 2 installer, please follow the link below.
If you want to upgrade from Gallery 1, you first need to install Gallery 2 and then use the import module to import your data from Gallery 1. Please follow the link below to install Gallery 2.