Okay, it’s Archcraft, but still.. Let’s get Vivaldi going.

sudo pacman -S wget
...
wget https://downloads.vivaldi.com/snapshot/install-vivaldi.sh
...
cd Downloads
...
sudo sh install-vivaldi.sh
To uninstall, issue the following as root (or prefaced with sudo):

    /usr/local/bin/remove-vivaldi-snapshot.sh