Add to cart button disappeared after upgrade

I only see the product, but cant go anywhere after wards. Can anybody give me a hint?

Go in the Display tab of the configuration and turn on the "display add to cart buttons" option.

Well,

I turned it on, but the check out button is still not there..

web38.pv115.ncsrv.de/index.php?option=co...eo-analyse&Itemid=94


Is there a way to order and checkout a product without putting it in the cart before?

I can see the add to cart button there.

On the checkout, the next button is there too.

I don't understand what button is missing ? I see them all on your website.

Products have to be added to a cart. But as you have on your website, when you add the product to the cart, it redirects directly to the checkout. So that should meet what you want.