For update your client.exe in file "files"
download ressource hacker:
open client.exe with ressource hacker and go on "version info" -> "1" -> "1042"
replace with your actual NostaleX.dat file version (actualy 0,9,3,3051 in french, for other version, I don't know ^^):
FILEVERSION 0,9,3,3049
PRODUCTVERSION 0,9,3,3049
VALUE "FileVersion", "0.9.3.3049"
compile script , save , and enjoy ^^
(file version and product file version = X,X,X,XXXX)
(Value "FileVersion" ="X.X.X.XXXX")