downloads most popular listing - hide client login required if not signed on
downloads.php UX displays most popular in two places. The top left and the lower right. The problem being SEO. Any listing that requires purchase or client login should link to the product page. All listings should point to the download detail page so that we get the most SEO value.
I believe the lower right does link to download description. That's good. If it's a product for sale, link it to the product page for purchase.
Also include a tab for downloads in theme 6 header navigation.