Version 1.1.7 is the most recent version of Site Assist Professional.
Try deleting the Dreamweaver Cache file from the users configuration folder:
common_installation_issues.pdf
If you are still having problems, please provide some details about your site definition:
1) Local Info Tab, what is the full path in the Local Root Folder setting.
2) Testing Server tab, what is the full path in the Testing server Folder setting.