3D FlipBook - I just purchased the Pro version of 3D FlipBook from Envato. I am having the same problem with Pro as I had with Lite which

I just purchased the Pro version of 3D FlipBook from Envato. I am having the same problem with Pro as I had with Lite which is that I cannot load more than 78 pages into a single flipbook. I am using only image pages. What can I do to resolve this issue?