Thanks for considering Aspose.Slides for .NET.
I have checked your license file for Aspose.Slides and there is no problem with it. It seems there is some coding problem, probably you are not declaring license object.
Since, you have two license files for two products; so you need to set both of them separately. Every product has its own license class e.g
It means, for using license of various products, you will have to use complete name of License class to avoid ambiguous names in different namespaces. e.g
So the proper way of setting license would be like this in C#
Aspose.Slides.License slidesLic=new Aspose.Slides.License();
Aspose.PDF.Kit.License pdfkitLic=new Aspose.PDF.Kit.License();
so on ..
One more thing, you must set the license before using any other product API.
For general programming information, please see products WIKI, for example, the Aspose.Slides.Wiki can be found at this link.
Other WIKI(s) can be located from this link.
I hope, it is helpful.