Tap your Profile icon and go to Purchased .
AltStore is another popular alternative to the App Store that allows you to install IPA files on your iOS device. Here's how to use it: facebook ipa for ios 12.5.5
If you are still holding onto a classic Apple device—like the iPhone 5s, iPhone 6, or the original iPad Air—you are likely running iOS 12.5.5. This is the final, stable operating system version for these vintage devices. While they are built to last, the modern app ecosystem has largely left them behind. Tap your Profile icon and go to Purchased