I don't have this game yet, so I haven't tried to install it. However I do have my notes for extracting the contents of a PKG file for macOS. The process has worked for me when I have installed games downloaded from GOG that were in PKG installer files, on macOS 10.13 High Sierra, from within
emacs 25 or 26.
I would guess it should also work with the version of emacs that comes with macOS, too, because my notes refer only to "dired", but I haven't tried because that version of emacs is very outdated (version 22, maybe from 2007?).
My notes:
The ".pkg" files are of the XAR format. Inside there is likely a "package.pkg/Scripts" file which is a gzipped file of a cpio file. First, unpack the "Scripts" file, then uncompress it.
1. Confirm package contents by listing (-t) with dired and !:
xar -tf ?
Extract the desired file:
xar -xf ? package.pkg/Scripts
2. Then ! on the "Scripts" file use either gunzip or tar:
gunzip -dc ? | cpio -i
Or this works, too:
tar -xf ? payload
Then look inside the "payload" directory. It might have the application within it as another directory named with the ".app" extension. Likely no need to dig deep, it shouldn't be in a subdirectory.
If the "payload" directory does not have an application in it, then it is likely the application itself. Therefore rename the "payload" directory as any desired name with the ".app" extension.
Either way, move the application wherever desired.
The "xar", "gunzip", "cpio", and "tar" lines are commands available in macOS that can work on the command line, such as the Terminal application. Just replace the "?" with the relevant file name mentioned in the instructions. Step one refers to the installer file (the PKG file for a game). Step too refers to the "Scripts" file.
Yes I know, my use of emacs instead of a Terminal makes sharing my notes of what works for me more complicated for others. However, if you aren't familiar enough with the Terminal application (or similar) to figure out how to make those commands work on a command line without emacs, then I think it's probably too complicated for me to explain anyway.
Again, this is just copy/pasted from my notes (of previous research and trial and error) that I reference when I want to install a game from a PKG file. It's not the only way, I recall there are other commands, but this is apparently what I settled on for myself. It's very quick for me and works for me.
Maybe someone else will have other words to clarify further if you have any trouble with the using the command line.
