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/BusinessWorks/Plugins/REST_JSON/2.1.0/hotfix-17

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 2.1.0_HF-017(This Release)

Defect ID:  REST-1911
            Snakeyaml.jar has been upgraded to the version 2.0
            
Defect ID:  REST -1955
            A fix has been added to load the swagger schema as input when there is nested "type" and "properties" under one definition with Invoke REST API.

Defect ID: REST-1956
           Jackson core and Jackson-databind jar has been upgraded to 2.13.5 version.
           
Defect ID:  REST-1961
            XStream.jar has been upgraded to the version 1.4.20 
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