Cause
There is a newer version than the one you are currently using.
Solutions
Update to the latest release of Banana Accounting 9
The latest release of Banana Accounting 9 is version 9.0.5, released in December 2019. You can see the improvements on the Change history page.
If you choose this solution, go to the Banana Accounting 9 Download page, download and install version 9.0.5. This update is free.
Update to the new Banana Accounting Plus version
Banana Accounting Plus (or version 10) is the new subscription-based version, available in two plans - More information on Banana Accounting Plus
Easily switch to Banana Accounting Plus, and get 1 month free.
If you choose this solution download Banana Accounting Plus