When installing MetaTrader 4 from any app store, MetaTrader is presently experiencing some technical difficulties. As a result, we strongly advise against deleting the app, as this may result in you being unable to access your account from your mobile device.
In the case that you have already uninstalled the application from your device, you may be able to download it again by accessing your app store's purchase library, by following the steps below:
Navigate to the App Store.
Tap on the top right icon.
Tap on the "Purchased" button.
Search for "MetaTrader"
Download it by tapping on the cloud icon, after which the app will now start downloading.