This article is for PC computers.
All your box sizes are saved in a file that you will just have to copy from computer 1 to computer 2.
1. Type in %appdata% in the search window in Windows.
2. When the file folder pops up, click on shipleap
3. There is a file called packageSizes
This file contains all your box sizes. Copy this file somewhere so that you can then copy it to the same folder (follow steps 1 and 2) on computer #2. You will just need to drop the file in the folder on computer #2.
4. Close and re-open the app on the computer #2 and it should work.