I asked Kobo support about this and they sent me this....
Thank you for contacting Kobo Customer Care.
We are very sorry for the inconvenience but we can definitely help you with this.
Sometimes, due to having an outdated version of the Kobo Desktop Application on your computer will not download the latest update for your eReader. Therefore, we suggest that you proceed on uninstalling and reinstalling the Kobo Desktop at first, and then sync your library to your eReader.
Having mentioned the above, none of your books will not be affected. Below, we have attached the steps in order to do this. We suggest that you try the following:
* Please sign out of the Kobo Desktop Application by clicking on the account icon (the little man icon), and then clicking "Sign Out". Then, perform the uninstall and reinstall to refresh the application completely.
Uninstall the Desktop Application (Windows).
1. From the Windows Start menu, click Control Panel.
2. Click Add/Remove Programs, Uninstall a program, or Programs and Features (depending on your version of Windows).
3. Click Kobo from the list of installed applications.
4. Click Uninstall/Change.
5. Click Uninstall.
6. Click Close.
7. Restart the Computer.
Then please install the latest version of the Desktop Application (Windows).
1. Navigate to the Kobo website http://www.kobosetup.com/pc/explorer.
2. Double-click the saved file.
3. Follow the installation wizard.
4. Once installed, restart the computer.
We were glad to assist you today. If you have further questions or concerns please do not hesitate to write or call us.
Sincerely,
The Kobo Team
Done it, still no update.