Installing on top of ArchLinux
BlackArch Linux is compatible with existing/normal Arch installations. It acts as an unofficial user repository. Below you will find instructions on how to install BlackArch in this manner.
# Run
https://blackarch.org/strap.sh as root and follow the instructions:
$ curl -O
https://blackarch.org/strap.sh && sha1sum strap.sh
# SHA1 sum should match: 86eb4efb68918dbfdd1e22862a48fda20a8145ff
$ sudo ./strap.sh