If you install Seiko’s Smart Label Printer for Windows software on a new computer, you’ll want to copy the label library from your old computer. It’s stored in this file:
C:\Users\Public\Public Documents\Smart Label Printer\labels.sll
(Thanks to the anonymous comment on June 22, 2017 in this thread.)
Or just use the Label > Library > Export to file… wizard to move the data to the new computer.