rar from home:firef0x project

Select Your Operating System

For Arch Linux, edit /etc/pacman.conf and add the following (note that the order of repositories in pacman.conf is important, since pacman always downloads the first found package):
[home_firef0x_Arch_Extra]
SigLevel = Never
Server = https://download.opensuse.org/repositories/home:/firef0x/Arch_Extra/$arch
Then run the following as root
pacman -Syu
pacman -S home_firef0x_Arch_Extra/rar