I checked this a while back and It doesn't show in the addon manager, only addons I paid for can be managed that are installed. The migration addons also don't show in the manager.
I removed the install that I accidentally installed already if that's what you mean. I don't want it as an option in the list to install or be able to hide it in the list as well as the migration addons I will not use.
Or maybe move it down below where the other not so important addons are and only have the active ones at the top in a separate block so this mistake is less likely to happen.
Edited by DanielH, 11 October 2017 - 12:39 PM.