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/sFTP/6.2.0/hotfix-01

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 6.2.0-HF001 (This Release)

BWSP-639
Request to add the support for Socks5 proxy server.
A new field 'Socks5 Proxy' checkbox is introduced on the shared resource to use 
Socks5 proxy server. To see the field, first select the 'Firewall' checkbox.

BWSP-644
No support for the custom properties supported by the JSch library.
An optional field named 'Config File' is introduced to provide a properties
file for a particular session.
The format should be property=value on a separate line.
Please select the 'Use Custom Config' checkbox to enable the above field.

BWSP-675
Algorithm negotiation failed for 'ssh-rsa' because of the different JSCH jar
versions.
An optional field named 'Config File' is introduced to provide a properties
file for a particular session.
The format should be property=value on a separate line.
Please select the 'Use Custom Config' checkbox to enable the above field.

BWSP-633
Migration from plug-in for sFTP 1.x.x to 6.2.0 does not work.

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All Supported Platforms

TIBCO ActiveMatrix BusinessWorks(TM) Plug-in for sFTP 6.2.0 Hotfix-01 is now available