The membership download pages
The thumbnails on each download page show the entire un-cropped texture images scaled down to fit inside the box. Hovering your mouse over a thumbnail will show you a 100% fully zoomed in section of the image. Use the "Enlarge" icon at the top of each thumbnail, or simply click the thumbnail itself to view a larger version, or the "Tiled" icon to view a tiled version (if one exists).
Below each thumbnail you will see the different sizes of the image; simply click the resolution you wish to download. Version that appear with white text are there to show you that a larger version exists. You will require a paid membership to download the large versions (if one exists) of each texture.