There haven't been "pro" versions for most instruments in a while (since they discontinued the basic "free" version).
Looking around the web site in the instruments pages directly, all these seem to be $0 right now except for a few (the remaining "pro" versions for USB instruments and a couple of other ones).
It would be good to know if it's a mistake or some new policy (Benchvue's licensing scheme seems to change every year or so, so it wouldn't be surprising if it changed again).