We're currently on version 11.2.2+build.622, I'm curious if we should just install one of the below downloads. Also I see there were a lot of "hot fixes" for V11...do i need to install any of those prior upgrading to V12? Automation.Engine 12.1.0 HF1 - AutomationEngine Linux / Automation.Engine 12.1.0 HF1 - Image
The latest version 12.1 HF1 includes all the previous fix of the previous version 11, so you do not need to install all the previous versions.
You can check it here on you release notes website: