^^^ you see these little letters. (where you can download this mod for voobly) ?

hi
mods are here: https://www.voobly.com/games/view/Age-of-Empires-II-The-Conquerors/Game-Mods

That mod is available at [You must login to view link] for aoeHD hotkeys. There is no aoc version of it, also not really seems reason to make one, as it not follows your hotkeys automatically and every different hotkeys would request an own pack of pictures for it (a base aoc hotkey displayer would not be correct with the Viper hotkey mod).

I've made a port of that mod at request: https://www.voobly.com/gamemods/mod/988/Displayed-Hotkeys-HD

As Gallas said, for other hotkeys it would need a different mod. It's easy to port such a mod from HD to Voobly though, you can use this mod as reference for the folder structure needed.

Didn't know you already made it (I guess it wasn't sent to normal approval request), so thanks for it!

kotofei, you can try that, but keep in mind, not just your hotkeys won't follow those displays if you change them, but this display may won't work for datamods (except WololoKingdom).