The setup running a silent (un)installation will fork into java and quit right afterwards, just like all other silent installers in the Websphere series. You will need to watch the java.exe task until it ends. (i.e. using the taskwait.exe tool)
If your sources do not contain the Language Pack your Regional Options in Windows must be set to English, even if you deselected the Language Pack in the responsefile. Otherwise Setup will fail without any errormessage.
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