This is indeed terrible news, Will future version of RobotStudio have the features that are being removed? e.g. fencing models, WorldZone visualisation, logic blocks, etc?
Go to wayback machine, an internet archive site. Paste this into the search bar: https://robotapps.robotstudio.com//
You may be able to find some of those that you were using.
The problem is: some of these Add-Ins are developed by ABB but aren’t available on RobotStudio’s RobotApps. For example, ABB developed an open-source Robot Operating System (ROS) driver (https://github.com/ros-industrial/abb_robot_driver) for EGM and RWS. However, it relies on the StateMachine Add-In. I can’t find that for my life, and they kept referring to RobotApps Add-ins to download the drivers. Is there any way I can still get those?