This sometimes happens after updating your iOS or app version, and you simply need to reactivate your Apple device. First, make sure you are logged in with the same Apple ID that you used to make the original purchases.
Second, tap Subscribe, then tap Restore All Purchases.
You should now be able to access these purchases, but you will need to tap the covers to redownload them.
If you are a current subscriber you may also wish to migrate your billing.
If you are a past purchaser (not currently subscribed) you may wish to begin a free 30 day trial to test drive all of our new improvements!