Alexy you are aware of the fact, copy-pasting library won't help if it's not registered?
Anyway, I think it's the matter of the computer he is working on - it's in the internet cafe (look in the right upper corner) and he brought game client on pendrive, so I am guessing this station is running some kind of virtual machine, that's why it's prompting about Windows image. Also, all your advices are probably useless, b/c usually clients cannot install anything on internet cafe's computer - insufficient privileges.
Try properly installing game client on YOUR computer.