I downloaded the game from HOTU (blergh, 14 mb, 5kb/s) and it is a CD rip. I feel like a complete noob, but I don't know how to make the game work.

I just opened one of the RARs, and found an installation tool. After installation, this appeared:

'Great!', I thought. So I started DOSBox.

Of course, I already did that beforehand, but I gave it another try. Same result.
Now, I know there is a trick to for faking CD-roms (something with mount -t cdrom or something) but what exactly should I mount like that?
Thank you.