You mean the ISO file inside the ZIP file? Those are converters to Postscript. The printer doesn't accept PS natively, that has to be done by a Windows driver, hence you need Windows.
Fuji Xerox Docuprint P205b Software For Mac
The 205 model, as opposed to the 205b model, may have accepted Postscript. Music cut free for mac. That would explain the old timestamps on the driver. But 205 b is a GDI printer so that's the end of hope.
Fuji Xerox Docuprint M205b For Mac Mac
Finally, Fuji Xerox themselves say that this is not compatible with Unix/Linux. Go search for yourself on '205b Linux driver'. I'd be surprised if you get any success stories. All the hits I encountered say no luck.