The Aquatox developers have created a dedicated page where you can see and download all the resources available for this application. I recommend you to visit the link posted below to reach the downloads and training. You will have better luck getting the answers to your questions in this manner.
Official website: https://www.epa.gov/exposure-assessment-models/aquatox
On the page you'll find training materials, sample files, downloadable examples, models and documentation.