Yes, pwSurface 2 is a new product. The original pwSurface has not been updated to work in recent versions of DS. I think there was an upgrade version or discount, but I’m not sure if it’s still available.
Yes, I bought it recently (PWS2) and the file I downloaded was 8258_pwSurface2_1.2_ds.exe, so, a diferent product as Richard says. I think it was during one of the sales last year, and it was discounted. I think previous owners of pwsurface original go a larger discount, but you could ask Support to see what they can do for you.