If I’m not mistaken couldn’t you just mount your already configured grub bootloader to /mnt/boot?

For example, during the arch install if your grub is at /dev/sda2, couldn’t you do mount --mkdir /dev/sda2 /mnt/boot?

Somebody who knows more than I do can definitely jump in here as well! But could give that a try

That seems to have fixed the issue! Thanks for the tip!

Ahh did you install the launcher through steam or are you running through Lutris?