@Foley No you have a different error and I answered in your thread.

@AdvancedSpectrum I know this error, but I'm unsure about the cause on your computer. This happens if two different versions of the client mix up after an update was not properly installed.

You said you uninstalled and cleaned it. Did you delete the folder C:\Program Files\Downlords Faf Client (or wherever you installed it) after uninstalling? I'm afraid there are leftovers which cause issues.

That's the only reason I can think of right now.