To reinstall the app on a new device there are two steps required.
Step 1: Request a new pin.
Step 2: Download the app again using the device specific instructions below.
To manually install or update the Android app, simply go to the Play Store and search for the app. If an update is available, the download button will say Update instead of Install or Open.
When reinstalling the iOS app, the Apple Redeem code that is supplied with the new pin email is not required and will only present the message: "Cannot Redeem Code. You've already redeemed this offer."
As the iOS app is a Private app, you cannot just search for it on the App Store - the app does not exist for the general public. The user needs to go into their existing purchases on their iPhone and the private app will appear in the list for re downloading or updating. See the Apple instructions below...
Once in the My Purchases area, scroll down through the list of available apps and then select the Download or Update option on the right.
1. Go to Settings.
2. Tap App Store.
3. Turn on or turn off App Updates.
Open the Google Play Store app.
At the top right, tap the profile icon.
Tap Settings and then Network Preferences and then Auto-update apps.
Select an option:
Over any network to update apps using either Wi-Fi or mobile data.
Over Wi-Fi only to update apps only when connected to Wi-Fi.