RESOLUTION:
On a new/clean PC, make sure there is no Stat Windows Client 5.7.x version installed
Navigate to Stat_Windows_Client folder.
1. Generate response file Setup.iss by running:
setup.exe /r /f1"C:\temp\Setup.iss"
Setup.iss holds all user selected options. ( destination folder, checkeboxes options etc.)
2. Copy Setup.iss file where Stat Setup.exe is located.
3. On target machine run command Setup.exe /s
For more info read here:
http://helpnet.flexerasoftware.com/