You can login to the Member's Area, access.videomakerfx.com, and then on the top part, you can select the ProThemes Membership link.
It'll bring you to the ProThemes Membership download page. Just download the .zip file for the specific month that you need and make sure to download the Slide Installation Instructions as well. The link is on the same page. Alternatively, here’s the direct download link:
Once you open up your VideomakerFX, click on "Add Slides" and then you'll see them under the "Themes" column and starts with the name "ProThemes"