Hi Judah,
To download Revit, go to a product page that has the right files and tick 'Revit' in the 'Downloads' tab on the right. Once you have ticked Revit, click on the download button underneath it. If you are having trouble finding the right products, you should do a search for the specific product you are looking for and then tick 'Revit' in the 'Formats' filter on the left hand tab. You will then only see products with Revit files.