Problems here too downloading the free content for Affinity Photo. MacOS Sierra. No content listed to download on the welcome page. Tried the uninstall/install, but that didn't help.
Website is very hard to navigate. Seems like maybe you have 3 different web development teams all going 3 different directions, in my opinion. Main page, store page and forum page all are very different. You might pass this along. It would be nice to have some interoperability on the site of such a fantastic product.