Hello,
Thanks for your feedback.
According to the screenshot you provided, you should be using the old free version. Sorry for the issue which has been caused by the free version. I confirm that the commercial version works well. Please upgrade your dlls to the latest commercial
Spire.PDFViewer Pack Version:3.4.
The detailed dll version information is as below.
Spire.License.dll v1.3.6.40
Spire.Pdf.dll v4.4.6.2040
Spire.PdfViewer.Forms.dll v3.4.0.3340
Spire.PdfViewer.Asp.dll v3.4.0.3340
In addition, to help you better evaluate our product, a one-month free license has been sent to you. You could
apply the license to remove the warning message.
Sincerely,
Jane
E-iceblue support team