Okay, I've spent several days trying to install AROS. It's probably time to share what I've learned.
I had tried to install AROS under Mint Tessa 64. Unfortunately, I ran into a message that said some files did not exist. After checking, I found the files did exist. I set their permissions at a level there should have been no problem, but the problem still existed.
Since the problem occurred in a directory called “Arch,” I concluded that the original work was probably done using Arch Linux. I tried that, only to get terribly lost. I would bet Arch is probably fine if you need to work with Linux at a very detailed level, and don't want things pre-decided for you. But that's not me.
Since Manjaro is based on Arch Linux, I decided to try it. That's when I found that AROS uses some of the commands which appear to have been built into Debian and its derivatives. Commands like “ifconfig”, are now depreciated in Arch and its derivatives. My resulting opinion is that AROS may not install under the newer versions of Arch.
Someone suggested the problem might be that I was using 64 bit Linux software, and that AROS was 32 bit software. That sounded plausible, but my 32 bit copy of Mint Tessa won't install on my 64 bit machine. It may just be my copy and/or my machine, but it won't work.
I dropped back to Mint 17.1 32 bit, which installed satisfactorily. AROS appears to install under that operating system, although I hasten to say I've just installed it. I haven't run it.
This probably concludes this train of thought. I'm sure when I actually start using AROS, I'll have more questions. Thanks to everyone for their suggestions!