It appears the CSS Sculptor for Expression Web is no longer available. It is not listed on the WebAssist site. I have asked for confirmation from WebAssist but nary a word as yet. Too bad as it was a product I used quite often.
NOTE: October 5th. This product is no longer available although they will continue to support those who have purchased it in the past. WebAssist will be concentrating on addons for Dreamweaver.
Yes, I noted that some time ago and asked them if they were going to upgrade. The answer was no…. Unfortunate, as it was great as you say.