Fortnite – How to Fix Failed to Initialize BattlEye Service

Answer in Progress

Issue is caused by Kaspersky Internet Security, which for some reason assigned High Restricted (based on heuristics) application control setting, and subsequently denied it for “code intrusion”. Manually assigning Trusted rating solves the problem.

For mods in general, be sure your currently installed version of Civilization is compatible with the mod.

In this specific case, the Caveman2Cosmos mod did not work because Civilization IV: Beyond the Sword was not patched to the latest Beyond the Sword version, 3.19.

The in-game patching has not worked for me on the three computers I've tried with it, but fortunately it is also possible to manually download and install the v3.19 patch from the downloads section of Firaxis Games' website. This worked like a breeze and I am now able to play the awesome C2C mod.