Console application does not matter, actually the code matters, once you could successfully understand it either by reading it or by running it, you can use it in your asp.net application.
The code actually reads in the source in.ppt and finds the Excel Chart whose alternate_text has been set by me as oleobject, then it creates a worksheet object, update its values, gets it back and then update it.
Just run the project as it is, don't do any modification, it should run successfully.
Or, you can try making the new console application, copy all of its code, add reference to Aspose.Slides.dll and Aspose.Cells.dll, place the in.ppt in debug directory or change the path of it and run it.
Evaluation versions don't have any limitations except of having watermarks.