This is Cthulhu Dark Zero, the preview version from the Cthulhu Dark Kickstarter.
This is here so Kickstarter backers can download complimentary copies for free. If you didn't back the Kickstarter, you probably don't want this version: you want the version that's available at Indie Press Revolution.
https://www.indiepressrevolution.com/xcart/Cthulhu-Dark-Print-PDF.html ... [click here for more]