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Looks to me like the plugin itself is causing an error and therefore cannot be displayed by Blesta. You may notice this in your error logs as "Undefined offset 0". It appears to be a bit of the chicken and the egg problem. The plugin tries to assign a database record of itself to the variable "$this->plugin" before it's installed, but it could only work after it's installed. You may be able to workaround the issue by commenting out the line in the constructor: list($this->plugin) = $this->PluginManager->getByDir('blesta_cms'); //list($this->plugin) = $this->PluginManager->getByDir('blesta_cms'); I haven't tested this, but it may work for you. The plugin author should fix the error.