Use the Camera Raw 14.5 installer as a baseline for older applications, though version 11.4 was the specific update tied to the CC 2019 lifecycle.
Camera Raw Filter Download for Photoshop CC 2019: Enhancing Your Editing Workflow camera raw filter download for photoshop cc 2019 hot
Yes, it is included for free with any legitimate version of Photoshop CC 2019. You do not need an extra license. Use the Camera Raw 14