Hey jsm2501 -
You can go into the *.py and edit the file to change the Windows the tool generates to be sizeable. By no means does this guarantee that there will not be other problems.
Here is a brief rundown on a way to fix this issue you are having. Before you begin make sure you have the latest version of the ART installed and my suggestion is make a back up of any file you alter. You can then open up the ART_skeletonBuilder_UI .py, which is in the General\Scripts\ folder in your original ART directory and run a word search for “sizeable = False” and change the False to True.
If you are really not comfortable missing or looking at coding, I would suggest you wait if possible; it is an issue we are aware of and are working on supporting 2015.
Thanks -
Eric Ketchum