I purchased STL Pro but only the starter library is visible
All Libraries are included in the purchase price for See.Touch.Learn.® Pro, but they must be downloaded. If we included all of the libraries and lessons in the app, it would have been too large. Go to libraries, then available for download, then click the install button. You can tell which libraries have not yet been downloaded by looking for the cloud icon on the libraries that are “still in the cloud”. If there is no cloud icon, then the library is on your iPad.
Please make sure that you are connected to the internet.