Hey roy.tattersall,
Regularly updating your application ensures you'll always have access to the latest enhancements and bug fixes. The desktop app is designed with convenience in mind, and resolving installation/update errors are no exception. I'll be happy to help you sort this out.
If you have access to the top menu bar, it's just two easy steps to resolve most issues with the desktop app:
- Select Help.
- Choose Reset App Data.
Otherwise, this great article includes additional troubleshooting steps, as well as instructions to uninstall and reinstall the app: QuickBooks App for Windows and Mac - General support
Let me know how this goes! I want to make sure you can benefit from the ease of using the QuickBooks Online app.