I realize I'm late to the party but I thought this might be best here, feel free to move it if not.
I've followed the discussion here and a follow on thread https://forum.keyboardmaestro.com/t/prompt-for-user-input-window-position/22348/5
I made the Center Front Window at Position macro by directly entering it into the KM editor... I ONLY had Keyboard Maestro as an option for the "in" and it didn't work.
Then I downloaded your version from here and it indeed shows "Keyboard Maestro Engine" in the "in" section and it works (thank you)
BUT... when I try to enter another window positioning task I still ONLY see Keyboard Maestro as an option, not the Engine. Did your "alias" somehow come along with your macro?
I tried rebooting and your macro still works but its the only one that can use "KM Engine"
So how do I add the alias (I couldn't follow the instructions you first put here sorry) and are ghost aliases real?