What happened to "Gospel Principles"?

My iPad updated on Sunday and it no longer contains "Gospel Principles" in the LDS Library app. That's the book we use in Sunday school. I tried deleting and re downloading the app from the Cloud thinking it was the older version but Gospel Principles doesn't come back. I tried looking to see if it was in other books in the LDS Library but it wasn't. How do I get it back? I do have the hard copy of the book but it is so much easier to look up the referring scriptures by clicking and get back to the lesson using the iPad.

What Version of LDS Library are you showing?

If you go to LDS.org on you iPad, go to resources and click on it. Go under General in the drip box to Magazines and Manuals and click on that. Go to All Manuals and click on that. Go to Sunday School and click on that. Gospel Principles should be an option there. I have book marked the page with all the Chapters to make it easy for me to find it in the future.