This file was saved with version 8 and contains new functionalities that are not supported in this version. Continue opening the file?

Cause

You are trying to open a file created with version 8, that contains the features not supported by the version in use (earlier). All data affected by the new Banana 9 features will not be available with your version.

Solution

In order to use all the new features you must upgrade to version 8, by purchasing the license key.
Install version 8 and open your accounting file with it.