We needed to do a service pack for our product and I have just downloaded the new Aspose.Slides component. I removed the old reference to Powerpoint and Added the AsposeSlides reference and then did a global search and replace.
It all worked first time... Except for the fact that now our generated ppt's now have EvaluationVersionOnly.
Do I need to get my AsposePowerpoint license upgraded to Aspose.Slides? There is no error when it reads the embedded license file.