The installation of iPrint xClient fails on 64-bit machine because of the dependency on 32-bit XULRunner. You can resolve the dependency on 32-bit XULRunner by doing any of the following:
Installing the package, zypper install novell-iprint-xclient-sl-6.502.20090805-4.x86_64.rpm resolves the dependency on 32-bit XULRunner and installs the iPrint xClient on 64-bit machine.
Installing the package, zypper install mozilla-xulrunner190-32bit downloads the 32-bit XULRunner. Then you can install the iPrint xClient on 64-bit machine.