Just purchased- not working – Nursery Rhymes by Dave & Ava Review

Just purchased this app and it will not allow me to download any songs. It says I would be connecting to an untrusted server. There is no easy way to contact the developers, I only found an email address from reading other negative reviews. My daughter loves the videos on YouTube, so I thought I would splurge on the app. I’m so disappointed. What a waste of money.
Review by sadparent123 on Nursery Rhymes by Dave & Ava.