Also be aware that there are some things that Splunk does that are not evident when the Splunk installation process happens and these will NOT happen if you manually unpack into the apps directory. For example, the family of seckit apps on Splunkbase will be completely broken if you manually unpack them. So you should never manually unpack and always use the proper CLI command: $SPLUNK_HOME/bin/splunk install app <path-to-app-tgz-or-spl-here> to upack for you (or the GUI method that I described in my other answer).
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