Could we please continue this topic in English, as we are currently a little short on German speaking staff. Why are you saying return, did you have it and then stopped working for you? You could set up your php.ini settings and increase your upload limit, or you could increase it in joomla. You can install it via FTP using this tutorial, you can see manual installation in the end of the page: docs.joomla.org/Installing_an_extension
If you have any issues I would be glad to help you.