https://www.battleye.com/support/faq/ original
FAQ
When connecting to a BE-enabled server I get kicked with a request to restart my game. How can I fix this?
This is happening because you permanently declined BE installation by clicking “Do not ask me again.” in the BE Launcher window previously. To fix this please go to the “BattlEye” folder in your game directory (e.g. “ConanSandbox\Binaries\Win64\BattlEye” in Conan Exiles) and double-click the “Install_BattlEye.bat” file