Unpack Sausalito PKG file
Most PKG files for Sausalito machines are encrypted tarballs. You cannot just open them with
tar zxf Filename.pkg
like you can for RaQ 4 and before.
To open the PKG and see what's inside it, do
gpg --decrypt --output Filename.tgz Filename.pkg tar zxf Filename.tgz
Alternatively this can be combined into one step:
gpg --decrypt Filename.pkg | tar zxf -