Recently our aspose.total has been renewed and when applied to our application it is giving evaluation watermark for slides. but Word and excel are working fine.
I have observed your comments. Can you please share license file along with sample project to reproduce issue. Also please visit this thread link:
This will help you to resolve your problem as well.
We can provide you screen shots of code and error/output.
How can we share the license file?
Please find the screenshots.
I have checked screenshot shared by you. I think you are using very old product which is 4.3, Can you please try to use latest version of Aspose.Slides which is 19.1 on your end and share feedback with us if there is still an issue.