I can not open my Quick books Pro 2016
Hi S Redfern,
This error code means that the system could not load the license data or there are missing/damaged files.
We can fix it by installing the latest Windows updates.
Then, install QuickBooks again. If the error persist, please follow the troubleshooting steps in this article: Error 3371: Could not initialize license properties.
Keep up posted if you need anything else.