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For more detailed instructions, take a look at the Installation Guide

Installation of this plugin is fairly easy:

1. Download the plugin from here.
2. Extract all the files.
3. Upload everything (keeping the directory structure) to the /wp-content/plugins/ directory.
4. There should be a /wp-content/plugins/qtranslate directory now with qtranslate.php in it.
5. Activate the plugin through the 'Plugins' menu in WordPress.
6. Add the qTranslate Widget to let your visitors switch the language.