Resolution:
When EMS is installed the first time, the Installer will ask the following.

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Choose the action you wish to perform.

   1). Download Hibernate assembly from the public TIBCO download site.
   2). Specify the location of a previously downloaded Hibernate assembly.

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If "1" is chosen, a zip file ("product_tibco_hibernate_3.2.5.003.zip"), which includes all Hibernate files downloaded, will be created in the "assemblies" directory in the directory where Installer is run from. If EMS is uninstalled and installed again, the Installer will directly use this .zip file and does not ask to download Hibernate again.

The installation log shows the following:

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::INFO::, value for assembly is NULL, using internal license file
::INFO::, calling _doDownload();
::INFO::, Entering new DownloadTask: class com.tibco.installer.wizard.action.TIBCODownloadAssemblyWizardAction
::INFO::, TIBCOInstaller.setLGPLLicenseDeclinefalse
::INFO::, LGPL assembly already exists
::INFO::, match found..  set installLocation /opt/tibco/ems/8.2
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EMS installer does not ask to download Hibernate.

All