There is a Apple bug on the IOS version of the Guide App.  The user will report that they cannot download the SA Map.  This happens only when they are doing so on Data instead of using a WiFi connection.

Suggestion:

Apple is restricting the download of apps and in-app purchases in the App Store to 150Mb over a data connection.  There seems to be a bug with regards to the way this message is displayed on the in-app purchases and users do not see this message from Apple.  We have reported the problem and we are also looking for a work around to warn users.  However for now, please connect to the internet via  WiFI and then restart the download by either using Restore Purchases or clicking on the buy button again.  The App Store will recognise that you already purchased this item and not charge your account again.  A message to this effect will display at the end of the purchase process.

We do apologise for the inconvenience caused but this is a limitation introduced by Apple.