git clone https://github.com/SkeletonMan03/Hytale-Launcher-Linux-Installer.git
cd Hytale-Launcher-Linux-Installer
bash Install.sh

I could not get the Flatpak provided from Hytale to launch my browser to let me log in.
Then the binary launcher was just gray... Which lead me to find that an environment variable made it work.
It also doesn't necessarily stay logged in, but I'm not sure what's up with that.