Hi, try downloading and installing this https://www.microsoft.com/en-us/download/details.aspx?id=21
The other way is to use our client without launcher, but it requires manual action every time we make some important update - you can use system zip file. Just DON'T DELETE ANYTHING - unzip the folder and let it overwrite what it wants to overwrite. Links here:
https://update.l2shrine.com/update.ziphttps://update.l2shrine.com/update-nogamma.ziphttps://update.l2shrine.com/update-levelhack.ziphttps://update.l2shrine.com/update-levelhack-nogamma.zip