From within your dashboard, navigate to the 'Datasheet Creator" page, the link for which can be found in the dropdown menu in the bottom right of the page:
Here, you will see a list of all of your product listings:
From here, you can select which product(s) you wish to download a datasheet for, and which template you wish to use (currently there are two layouts, one with images and one without - we will add more template options in future).
Once you have selected the products and templates you wish to download, simply press the 'Download Selected' button.
If your product listing has 'Variations' associated with it, then you can either download a datasheet including all the variations, or you can download each variation as an individual datasheet.
These products will be highlighted with the 'See all variations' link which will expand your options, like this: