This article talks you through the process of redownloading the M-Topo OS 2013 mapping onto your iOS device after performing an app update.
The M-Topo 2013 maps have been updated and replaced with the newer OS map data. These can be seen in the Maps > Digital Map Store section.
To restore your M-Topo 2013 maps within the app first check you have the licences on your device using - Arrow > Cogs > Map Licences > Show Map Licences. If it's not in your list use the Recover In-App Purchases button.
Then to install the maps onto your device:
1. Paste the text below into an email and send it to yourself
2013 Mobile Topo - OS Landranger 1:50,000
memmap://open/?http://w2.memory-map.co.uk/mapchunks/GB/OS2013/app/os50_limited_2013.qct
2013 Mobile Topo - OS Explorer 1:25,000
memmap://open/?http://w2.memory-map.co.uk/mapchunks/GB/OS2013/app/os25k_limited_2013.qct
2. Open the email on your iPhone or iPad and click the relevant memmap:// link to install and start the map download