i have this exact same issue, and im trying to do this on my laptop.
to be a detailed as possible, this is exactly the course of events
Click launcher
click "play crpg"
update available box opens asking the following: update from v3.0.2.0 to v3.0.4.1, "yes" or "no"
click "yes"
Error box opens displaying the message: The remote name could not be resolved: 'download3.c-rpg.net', Do you want to try updating again, "yes" or "no" or "cancel"
clicking yes repeats the events above, clicking no allows you to play until you join a server, then it crashes with an error.
Same problem, i run steam version and run with 64 bit
Hmm, maybe its because the version i have on the game on steam, but how do i get version 1.4 ? I think the Launcher not support the latest version yet