We frequently upload updates to WriteMapper, which you can seamlessly download from your device.
To do so open up your copy of WriteMapper, while ensuring that you have an active internet connection. If you haven't previously stated otherwise, the app will automatically check for new versions upon starting up.
To manually check for an update, select the WriteMapper → Check for Updates... option in the menu bar of the app, and the relevant information will be displayed to you in a new dialog.
If you have issues with the in-app updating mechanism, you can always download the latest version from this website itself.
For instructions on how to install the latest version of WriteMapper, please see here.