This questions explains how you can show the total page number of your document in the footer on each page, i.e. show a “page # of ##” instead of the default “page # of #”.
However, even though someone asked for that in the comments, it does not explain how to do that in a KOMA class. It has been suggested to ask a new question.
scrlttr2 for a letter, so I'd like to do the same.
So how can I do it there?