Stein's always been responsive when I've emailed him. I had a problem with my old original reg code not being able to automatically authenticate in newer versions of Swath, and he even converted it to a newer code. This was about 2 months ago. He also added one or two features to Swath when I requested them many years ago, which blew me away.
Give him another shot. Besides, it isn't his fault you lost your codes

+EP+