Hello,
Thanks for your inquiry.
Our Free version is totally free without any warning message, hence you should be using our Commercial version. For your situation, there are two ways to remove the evaluation message. One is to download the correct free version (
Free Spire.PDF for .NET Version:4.3) to test again. And another is to keep using the commercial version, we could provide a temporary license file (1-month free) to help you remove it. If you need, please contact us.
Sincerely,
Nina
E-iceblue support team