Johnmart,
that message indicates that you are running the wrong version of the OfflineInstaller on your PC, 32bit OfflineInstaller on 64bit or vice versa.
There is also a good chance that you already had a LO-rpms directory in your home folder before you extracted the OfflineInstaller. In this case you will get multiple packages inside, so please delete any previous LO-rpms folder before extracting the new OfflineInstaller. In fact, I will include this test in the next version.
good luck!
-p.