Excuse my ignorance, but where would I get DOS32a for Mac OSX, or activate it using DOSBox .63?

I'm having two problems with Command & Conquer on Dosbox running Mac OSX 10.3.9. They don't occur together, rather it's one or the other: 1. When installing the game, I get the following message: "Unable to load SETUP.MIX file from CD-ROM disc." 2. I was successful in installing the game using Petit …