Signed pacman repositories for the Slipstream viewer (slipstream-bin, x86_64), so
pacman -Syu keeps it current. Pick one of the two repositories.
curl -fsSLO https://arch.slipstreamviewer.org/slipstream.asc gpg --show-keys --with-fingerprint slipstream.asc # must show C28FDB4A40AA8360D8DF0470AD8E61526C06E929 sudo pacman-key --add slipstream.asc sudo pacman-key --lsign-key C28FDB4A40AA8360D8DF0470AD8E61526C06E929
Stable releases:
curl -fsS https://arch.slipstreamviewer.org/slipstream.conf | sudo tee -a /etc/pacman.conf
Betas and releases (a beta user always has the newest build):
curl -fsS https://arch.slipstreamviewer.org/slipstream-beta.conf | sudo tee -a /etc/pacman.conf
sudo pacman -Syu slipstream-bin
Older package files stay in the repository for a while:
sudo pacman -U https://arch.slipstreamviewer.org/slipstream/os/x86_64/<file>.
More: slipstreamviewer.org/wiki/install.