You need iOS 11 or later to use Mobile Locker.
If your iPad has an older version of iOS, you need to update to iOS 11 first.
Open Safari on your iPad/iPhone and go to http://appstore.com/mobilelocker
Here's what you'll see in the App Store.
Tap the UPDATE button.
Once the update is done, close the App Store and open Mobile Locker. This is what the new icon looks like:
We release frequent updates to Mobile Locker. If you see this alert at the top of the main screen, you'll know a new version is available in the App Store.
You'll see this alert message when we release a new version of Mobile Locker (If you have v3.0 or later)