This hotfix can be downloaded from the SFDC Customer Portal Web UI, using your username and password for support.tibco.com. Once logged on you can find the hotfix under Download Menu:

AvailableDownloads/Adapters/Siebel/6.1.0/hotfix-4

Below is a summary of the update included. Please refer to the associated readme document for any additional information.
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Closed Issues in 6.1.0_HF-004 (This Release)

ASBL-1501
Unable to process events using JMS.

ASBL-1500
Siebel adapter stopped working after an upgrade of RV, TRA and BW

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