After a few problems I had with the settings I asked for support from Schultz. Their response is fast, and the help is good! Make sure You've got yr rights structure set properly, otherwise Joomla is not showing the download button. This is a Joomla thing, and does not mean the extension is not working!!
Ones I've got my settings and rights set the right way, the extension is working great!
You can't do without it if you wanne give yr website visitors a chance to download excel files!!!