The zip file contains _several_ RPM's. The individual RPM's can be found at http://www.wolfwater.com/openacs (however, i've found it easier to get the one huge zip file. YMMV.)
The reason we have to do it this way is b/c the SDM doesn't yet support multiple files.
So, unzip the big file to a temporary directory & read the included install docs. Good luck.
