You also have to configure the inputs.conf, which isn't mentioned in the docs, except there is a README directory in the app. Copy the inputs.conf.spec to local/inputs.conf and make the appropriate changes. After that, you'll need to restart Splunk. The app should then run the googleapp script to pull the reports from Google's API and write them to the lookups directory, if the csv files in that directory have a non-zero size, you'll know it's working. It take a little while for it to run. Hope that helps.
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