Hey bro, try to download the newest client and try again with the launcher, that should work, i had the same issue a few weeks ago and i solved it that way
Also try to launch the Laucher.exe with Admin rights, right click and Run as Administrator!
Usually windows wants the Laucher.exe to be launched as an admin.
I means that an interruption was happened between your internet connection and update server or your assigned IP address by your ISP couldnt connect to the update server. Try renewing your IP multiple times until you can able to connect.