This hot fix 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/DCRM/6.4.0/hotfix-03

Listed below is a summary of updates included. Please refer to the associated read me document for any additional information
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Closed Issues in 6.4.0_HF-003 (This Release)

DCRM-808:Invalid field value return with error "Activity output data validation error''
inside BW if we kept data type as 'decimal' with value '0'.

DCRM-849:Dynamic CRM plug-in's retrieve multiple activity does not expose hasMoreRecords
property.
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