It seems unlikely that you would have a version of CentOS which differs that much from supported versions of RHEL. You may get a warning which you must accept to indicate that support is on a secondary basis. As Sergey said, you would do better to ask on the forum pertaining to the component which gave trouble and be more specific about the problem.
Even under RHEL, supposing you wished to install both 32-bit and 64-bit support, the method isn't fully documented, so it's important to say what you are trying to do.
