Yes, make sure the following fields are enabled in your IIS logging:
cs_Referer
cs_version
cs_bytes
cs_Cookie
We pretty much enabled all the IIS logging and the app looks pretty good. Make sure to read up on the threads in here, we had to make a change to the Data Model in order for the app to work in a search head cluster. Also, read the latest update on http_user_agent.
https://answers.splunk.com/answers/442049/splunk-app-for-web-analytics-http-user-agent-missi.html#comment-641842
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I was having the same issue, ended up leaving all the options blank during the install and then it managed to complete without issue. Just means you have to set set the index server, etc, manually in the conf files, but I just copied them from a working system without any issue.
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