About the limit
Starting February 11, 2020 with RetailBox 5.1.2 and later, users from the App Store receive an increased 1GB data limit, up from 500MB.
If you are using RetailBox 5.1.1 or earlier, you won't get the increased data limit, and you'll need to update on the App Store.
With the limit, after you exceed 1GB worth of usage in-app, you can't download additional screen savers past the limit. After exceeding the limit, previously downloaded screen savers will continue to be available.