No it isn't possible to download all templates at once.

There is no need to download all templates.
You only have to download the templates you actually use.

If all our customers would download the complete 1 Giga byte batch of templates at once, our download server will turn unusable.

It is only possible to download one template at a time, choose a template style before you start downloading.
Please check the web templates gallery page to see previews of all our templates.

Click the preview window to get a full screen popup of an example website rendered in the chosen template and style.