Good news, ob2install also supports Windows platforms. You can run ob2install from UNIX/Linux CM to install/upgrade Windows clients. I've just discovered a documentation bug for ob2install, because the parameter list was changed. With the latest versions you might need to add an additional qualifier to your -input file.
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It is a matter of downloaded the Installation bits to your Windows Installation server, or to a stand-alone system, and running the 'setup' command. You didn't specify from what version to what version you want to upgrade, so, as an example, here is a link to the DP 7 Installation and Licensing Guide