For your old release, you might have identified a default My webMethods Server installation in the global path of the installation’s host machine using the environment variable WM_HOME. If you are going to install the new release on the same machine as the old release, the existence of this variable could cause problems, so you must remove the environment variable from the global path. Do not redefine the environment variable after installing My webMethods Server 9.8.

The My webMethods Server migration utility allows you to migrate specific server instances within the old My webMethods Server installation to the new My webMethods Server installation. You only need to install one My webMethods Server 9.8 on each machine in the cluster.