Make sure the mod folder is titled "40k" lowercase, otherwise the mod will not function properly. The path should look like this: "$/People Playground/Mods/40k".

Workshop downloaders will automatically name the mod folder after the mod ID, so make sure you change the name to this otherwise the mod won't be able to fetch the directory and access key files within. (This leads to invisible characters.)

If you're subscribing through the workshop you won't have to do this.