Film download not possible (insufficient space)

I cannot downlad any film. Everytime I get immideately the information that ther is not enough space to finish the download.
But there is plenty of space free on the harddisc. 
I tried different locations to save the films but always the same error occurs.

I didn't have this problem last season, as I downloaded almost 50 films.

Using the stream is working well. Also playing already downloaded films

Is there any solution?
Do I have to reinstall the app, which I'd like to avoid because of the configuration of the app.

Thanks for any adivse.

Thomas