Thanks to GitHub.com breaking the download feature on their homepage that we used to host the game updates, you will need to redownload the launcher to receive any future game updates.
Not everything is bad news though: thanks to hard work by Scoot, the Launcher also has a few new features and improvements:
You will need to redownload the launcher from the link at the top of the page to get them. Again thanks to Scoot for working on the Launcher.