doesn't even work on plugin author's site

The Plugin has been updated after this incident, it was caused due to change in google’s HTML structure.

And if you say “no” to using the included template and don’t include the php code in your own template, it doesn’t track 404’s. (I point this out because it can’t be used as a stand-alone 404 tracker without including it in your theme’s 404 template.)

If you intend to use this only for statistics, please consider using other great plugins available.
Statistics were included to reduce load on server that might be caused by using two separate plugins. (This plugin has been developed as a requirement of myself. I’ve shared it here so that everyone can benefit from it)

thank you for the update and the extra details.