The RPMs and source for openMosix are available from our Downloads/Files Section. Please read the release notes first!
Also, Gentoo Linux's emerge sys-apps/openmosix-user and Debian GNU/Linux openMosix packages are available.
No. Just like the older MOSIX, you should not mix nodes because the protocols are subject to unannounced changes from version to version. In addition, every new version has bug fixes which warrant updating to the new kernels.
Start by unpacking both the Linux kernel sources and the corresponding openMosix distribution in a directory, say /usr/src.
$ cd /usr/src; tar xzf linux-2.x.xx.tar.gz ;gunzip openMosix2.x.xx.gz
Apply the openMosix patches to the pristine Linux kernel sources with
$ patch -p1 openMosix2.x.xx-x