The implementation in this mod is kind of hacky. It would be much better if it just allowed us to pick tiles in the regular upgrade planner, instead of adding a separate thing. The most important impact of this, IMO, is that we can't right-click to downgrade and we can't add specific upgrade plans to our character's blueprint library.

Was trying to figure this out as i was trying to go from brick to hazard concrete. Guess I cant use the mod then and its back to copy paste :/

+1 I thought initially it was doing exactly what OP said, disappointed to see it is a separate thing which means extra shortcut clutter.

Likewise disappointed. I wanted to downgrade pathways used in one of my blueprints, to save on resources early game (and let my robotic labor force upgrade it later). Looked for a mod. Got this one, which sounded like it would do what I needed. It added a new shortcut to my menu. I thought "okay, that's fine, as long as it does what I need"... but it doesn't. I right-clicked the new item in my inventory but that just put it on my cursor, as opposed to the source/destination mapping GUI one would expect from the vanilla planner. Then I checked Settings >Mod Options to see if that had a source/destination mapping (GUI or otherwise), but it has nothing.