Hello,
Thank you for your inquiry.
Regarding the free version of Spire.XLS, please note that it is not actively maintained, and bug fixes are only updated in the commercial version. Furthermore, technical support is not provided for the free version of the product.
Therefore, we recommend using the commercial version of Spire.XLS(
Spire.XLS Pack Version:13.12) for your testing needs. We can offer you a one-month temporary license (free of charge) for testing purposes. If you are interested, please apply for it through the provided link:
https://www.e-iceblue.com/TemLicense.htmlIf you have any questions or require further assistance during the application process or while using the latest version, please feel free to contact us.
Best regards,
Annika
E-iceblue support team