Unzip the downloaded release, and change the name of the folder to `watermark`.
In the `ext` directory of your phpBB board, create a new directory named `dmzx` (if it does not already exist).
Copy the `watermark` folder to `/ext/dmzx/` if done correctly, you'll have the main extension class at (your forum root)/ext/dmzx/watermark/composer.json
Navigate in the ACP to `Customise -> Manage extensions`
Look for `Watermark` under the Disabled Extensions list, and click its `Enable` link.
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/src/Template.php on line 359: Array to string conversion
Array
phpBB encontró un error al construir el contenedor debido a una extensión instalada. Por esta razón, todas las extensiones se han desactivado temporalmente. Por favor, intente purgar el caché del foro. Todas las extensiones serán automáticamente habilitadas de nuevo una vez que se resuelva el error del contenedor. Si este error continúa, por favor visite phpBB.com para soporte.
Excepción: The definition for "_defaults" has no class. If you intend to inject this service dynamically at runtime, please mark it as synthetic=true. If this is an abstract definition solely used by child definitions, please add abstract=true, otherwise specify a class to get rid of this error.
#0 /srv/disk1/2868406/***/vendor/symfony/dependency-injection/Compiler/Compiler.php(102): Symfony\Component\DependencyInjection\Compiler\CheckDefinitionValidityPass->process(Object(Symfony\Component\DependencyInjection\ContainerBuilder))
#1 /srv/disk1/2868406/***/vendor/symfony/dependency-injection/ContainerBuilder.php(587): Symfony\Component\DependencyInjection\Compiler\Compiler->compile(Object(Symfony\Component\DependencyInjection\ContainerBuilder))
#2 /srv/disk1/2868406/***/phpbb/di/container_builder.php(198): Symfony\Component\DependencyInjection\ContainerBuilder->compile()
#3 /srv/disk1/2868406/***/common.php(115): phpbb\di\container_builder->get_container()
#4 /srv/disk1/2868406/***/adm/index.php(23): require('/srv/disk1/2868...')
#5 {main}
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/src/Template.php on line 359: Array to string conversion
Array