Bitrix24 Chat bots module is included into all editions of Bitrix24 On premise.
Module is not installed automatically upon deploying account distributive or when updating Bitrix24. It must be installed manually at the page Settings > System Settings > Modules. Additionally, local network setup is required.
Module won't be installed in the following cases:
Push&Pull module with queue server was not installed previously.
Web Messenger (im) module version not lower than 16.1.0 is not installed.
Account license is inactive.
Indicate website's public address
during the installation process for enabling account's Internet access. If you account is fire-walled or connected via router, access to /pub/imbot.php account page must be opened from marta.bitrix.info server.