The adapter supported now is the LOR sold Isolated dongle - USB485-ISO.
Yes, the update is for Showtime Suite 3 (S3).
I grabbed the new update yesterday. Although the updates are infrequent (compared to say new browser updates!), I wonder if a built in update checker is warranted. It would mean you wouldn't need to visit the official LOR website to see if there is indeed a new S3 update.