Run FastSubmit.exe.
If any beta version is installed on your PC, uninstall it first.
Default, Fast Submit will be installed in the directory "\Program Files\Fast Submit" of your system disk, but you can change this path.
Fast Submit is delivered with a small database in file sites.sxml. Possibly, the file sites.sxml have become outdated. In that case, you can update database through Internet of from the other file.