When we download/install the latest Aspose.Slides update i notice that there are two versions of the dll; Aspose.Slides.1.1.dll and Aspose.Slides.dll. Based on the file information the files are different (size and date time )however I am only referencing Aspose.Slides.1.1.dll in my project. Not sure if I should add a reference to Aspose.Slides.dll also. So far I've had no problem.
Thanks for your interest in Aspose.Slides.
Yes you are right that there are two .dll files. Please use Aspose.Slides.dll as reference for your development.
We are sorry for the inconvenience.