I recently bought The Ultimate Doom and I thought that I could download the files on my MacBook Air (My PC is having some issues at the moment so I use my school computer) and just run that through dosbox and play it like that. You can probably feel my disappointment when I wasn't even able to get the Microsoft Windows files (Because you can never get all of the download files on a mac for some reason). So i searched the internet for the rest of that day to try and find a way to run GOG's Doom on my current version of DosBox but nothing helpful came up.
If anyone who is an expert on this type of thing and can help me out on this I would appreciate it.

I think the GOG installers for Windows use InnoSetup, so I think innoextract can be used to pull files out of there. http://constexpr.org/innoextract/

If you use Homebrew it has a formula.

Alternatively, you can use Wineskin to make a blank wrapper and install it in there. Then you just take the files out of the wrapper.


(Chocolate Doom may also be an alternative to DOSBox, just throwing that out there.)

I just tried Porting Kit (at porting kit.com)m, and it seems to work. It was also easy.