[Deprecated] Splunk Universal Forwarder 6.5.1.1

Deprecating this version to allow for updated naming and package structure. Please use splunk-universalforwarder.

It's a good idea to specify either a RECEIVING_INDEXER or DEPLOYMENT_SERVER. You might do something like:
choco install splunkforwarder --params="RECEIVING_INDEXER=somehost:9997"

Details about all the parameters are at the Splunk docs:    
http://docs.splunk.com/Documentation/Splunk/6.3.8/Forwarding/DeployaWindowsdfviathecommandline

The GitHub home for this package is: https://github.com/dagryph/chocolatey-splunkforwarder