Day of the Beast is a classic, globe-spanning campaign for the Call of Cthulhu tabletop roleplaying game, originally published in 1998 by

Day of the Beast was written for the rules, but converting it to the current 7th Edition is straightforward. The core mechanics remain largely compatible; you will only need to convert characteristic scores (multiply by 5 for percentage equivalents) and adjust any skill checks as needed.

This is a point of confusion. There is no "Free" PDF. The term exclusive is commonly used by the community to differentiate between: