I just noticed that my Avery lables (8693) are not included with the list of commercial paper with Label Creator 10 (even though Label Creator 7 had them). Is there any way to add them?

Look at the label box, are there two ID numbers? Look at the other Avery labels to see one that is close. Chose that one and then print to a plain sheet of paper. Put that in front of the label sheet you have and measure the offset. Make that adjustment in preferences (option on the page where you select the paper.) Then offset.