Cant find 'Links' node in library

Hi I am looking for a certain node that allows to select a specific Revit link from a dropdown.

This post has a screenshot of it (also shown below).

image

I am in doubt if it is indeed coming from the Rhythm package.
I believed it was from SpringsUI but Im not sure.

I still had the node this morning, I even built some stuff with it. But then I did some un-installing and re-installing of packages and now I cant find it anymore.

Where should I be able to find this node?
Any help much appreciated!