You can download SketchUp from our downloads page in any of the above languages. However, SketchUp defaults to your operating system's default language. For example, if you've downloaded the French version and your operating system is set to English, you will still see the English version of SketchUp. To correct this, you'll need to change your operating system's default language; you won't need to reinstall SketchUp.
SketchUp Language versions
SketchUp Pro is currently available in French, Italian, German, Spanish, Japanese, Korean, Brazilian Portuguese, Traditional Chinese, and Simplified Chinese. SketchUp (free) is available in those languages plus Russian and Dutch.