Favorite app gone down!

This has been one of my favorite apps for more than 2 years! I had data that I depended on for a long time. Ever since the latest update, I have not been able to access my app. There is a "note" that appears on the screen when I start the app, and I cant move forward from the note. I cant click on "ok" or anything else. It takes a very long time to load, then does not work. I cant access any information! I am very disappointed and hoping that my data is not gone!

Sol 2 Sol about iPeriod Period Tracker +, v6.6