Hi, did it work before? If yes, try deleting launcher's settings file. I have it in
C:\Users\Emca\AppData\Local\Eressea_Launcher\L2_Shrine.exe_Url_vtiekvj2wnyyhqwlhwhmratizyvjm5pn\1.0.0.0\user.config
So just find this file (user.config) and delete (or rename) it