itch.io

I'm not sure if you can exactly download and put mods into your game, I think you would have to download the whole modded game and then play it from that. But I am no modder so hopeful someone can give a more confident answer. Could you say where you found the mod? Like, on discord or something like that.

Try checking the mods and coding on the server. Some mods have a released version that you can download and play like the dev version.