Can you try this please ?
Opt("WinTextMatchMode", 2) ;1=complete, 2=quick
Opt("WinTitleMatchMode", 2) ;1=start, 2=subStr, 3=exact, 4=advanced, -1 to -4=Nocase
Run('MSIEXEC.EXE /I secureclientinstaller.msi')
_WinWaitActivate("SecureAssess Central - SecureClient AAT","")
ControlClick("SecureAssess Central - SecureClient AAT", "", "[CLASS:TAeroButton; INSTANCE:3]")
_WinWaitActivate("SecureAssess Central - SecureClient AAT","Destination Folder")
Send("C:\Program Files\SecureAssess Central - SecureClient AAT")
ControlClick("SecureAssess Central - SecureClient AAT", "", "[CLASS:TAeroButton; INSTANCE:3]")
_WinWaitActivate("SecureAssess Central - SecureClient AAT","")
ControlClick("SecureAssess Central - SecureClient AAT", "", "[CLASS:TAeroButton; INSTANCE:3]")
Func _WinWaitActivate($title,$text,$timeout=0)
WinWait($title,$text,$timeout)
If Not WinActive($title,$text) Then WinActivate($title,$text)
WinWaitActive($title,$text,$timeout)
EndFunc