Seems to install ok, on SS 2.45, used these instructions https://github.com/silverstripe-labs/silverstripe-googleanalytics, config method and populated fields with GA credentials etc, which I've checked a few times, also run dev/build and flushed ...
There is an error in the CMS, when I click "show visits/page" I get a pop up which simply states "the page at www.xyz says: error", no real actionable feedback.
Inspecting the page a bit I see the ga.js file is in there, though not really sure how to proceed further in finding and correcting whatever the fault is, and also how to tell for sure everything is hooked up correctly with this mod.
P.S. In GA account for this site I get this status: tracking not installed