The Try/Catch action (v10.0+) allows you to execute a sequence of actions and catch any failure. If any action in the Try sequence would abort the macro, the macro instead continues executing the Catch section, setting the Action Result, available in the %ActionResult% token or Action Result condition.
Keep in mind the Action Result will be cleared at the end of any successful action, so if you want to know why the actions failed you will need to handle the Action Result in the first action of the Catch sequence, perhaps by saving the %ActionResult% in a variable.
If the actions in the Try sequence execute to completion, the Catch sequence is not executed.
If an action in the Catch sequence aborts, the macro aborts as usual.
You can explicitly throw an error using the Throw action.