Hello,
Thank you for your feedback,
The Office version need to include updates for all other products, the release time will be later. We will notify you once the Office version is released.
Also, is the older version of Spire.office currently being used in your project? At present, our products are independent, if you are using a newer Spire.Office version, there is no need to wait for the Office version update.
You can try first remove all Spire references from your project, install Spire.Office 11.5.0, and then install Spire.PDF 12.6.9 version for verification. If you have any other questions, please feel free to contact.
Sincerely,
Lisa
E-iceblue support team