This is indeed a scam, the program doesn't send any packets to check for login, and the guy claims it's a client sided error which he "sent to development team".
Pure scam, don't purchase and I hope the mods investigate this thread then close it.
Screenshots here
[Only registered and activated users can see links. Click Here To Register...]
I can provide the .exe that he sent if you'd like more confirmation.
[Only registered and activated users can see links. Click Here To Register...]
[Only registered and activated users can see links. Click Here To Register...]