Because of a file permission issue you may run into errors like the two below when the launcher is trying to update itself or the game client.
Easiest way to solve this is to manually download and install the latest launcher. It will correct the file permissions and apply any existing game updates.
Once downloaded, run the file. If asked, confirm you want to overwrite the existing installation.
You do not need to run the launcher itself after the installation is complete.
Now you're all set. Login at thehunter.com to play, if there are any new game updates they will automatically be applied next time you play the game.