If STAAD. Pro is also installed then uninstall the SFA 8.0 and the CONNECTION Client and then install SFA 8.0 once again along with the version of CONNECTION Client coming with STAAD Foundation Advanced.
Actually somehow the CONNECTION Client coming with SFA was not able to overwrite it's former version installed along with STAAD. Pro. Now it will be possible to execute all the modules properly. May be the problem was regarding the CONNECTION Client compatibility.
This issue is already taken care of by the Development team and as there is a plan of a new release very soon it will be reflected there.