If you've purchased the full tour and need to restore it (e.g., after reinstalling the app or getting a new device), follow these steps:
Launch AudioVenture.
Go to Settings or tap a locked stop. You should see a "Restore Purchases" option.
Sign in with the same Apple ID you used for the original purchase. The app will automatically restore your purchase.
Make sure you're signed in to the same Google account used for the purchase in Google Play Store.
Launch AudioVenture. The app should automatically detect your previous purchase.
If automatic restore doesn't work, look for "Restore Purchases" in Settings or when tapping a locked stop.