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-15

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-015 (This Release)

Defect ID: REST-1924
           An issue has been fixed where REST exceptions were not caught through the catch activity.
           
Defect ID: REST-1925
           A fix has been provided where a JSON string containing the escape characters parsed incorrectly using Parse-JSON activity. 
           The above-mentioned issue has a property-based solution.
           The name of the property is "com.tibco.plugin.restjson.json2xml.restrictinvalidescapecharacters".
           The user needs to set this property to "true" to enable the fixes. The default value is false.

Defect ID: REST-1932
           A fix has been added where invoke REST API call throwing error instead of a valid response.
           
Defect ID: REST-1903
           A fix has been added to provide the well-formatted JSON in the POSTMAN or CURL command while processing Spanish characters in input with REST dispatch and reply activity.
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TIBCO ActiveMatrix BusinessWorks Plug-in for REST and JSON 2.1.0 HF 15 is now available

All Supported Platforms