How to install the package 'dpkg' from the AUR

Today I installed Archlinux and I tried to install the following package 'dpkg' from the AUR. I tried 2 methods: pacman -S dpkg and after that failed I downloaded the *.tar.gz and tried: pacman -U dpkg.tar.gz At the first option I got the following error: [root@localhost andreas]# pacman -S dpkg Fehler: Ziel nicht gefunden: dpkg and at the second option I got this error: [root@localhost Downloads]# pacman -U dpkg.tar.gz Lade Pakete... Fehler: Fehlende Paket-Metadaten in dpkg.tar.gz Fehler: 'dpkg.tar.gz': Ungültiges oder beschädigtes Paket The error is in German and means "Invalid or Damaged Package". I don't get why pacman can't find the package because it's here: https://aur.archlinux.org/packages/dpkg I'm fairly new to Archlinux, I have mainly used Debian and its Derivates before.