I have the latest version 3.
I have a new laptop with vista64bits and CS4 installed
I have installled succesfull 3 extensies, formvalidator, joomlatemplate kit and capthaform.
Updated the extensionmanager to the latest.
I have tryed to install only Dreamweaver cs3, The older version.
Also tried to install CSSculpter 3.00 and I get the error see atachement.
On my XP PC the install goes good.