How can I download this?

Hi Leon, unfortunately this brand does not have any BIM/CAD files for their products. The easiest way to find products with the right files is to do a search and then use the 'Formats' filter to tick the relevant file formats. You can search for a particular product or even do a blank search like this: https://www.modlar.com/search and then tick the format on the left hand side. Let me know if you need any more info.