Can't get it to work

[i3vie]

Hello. I'm sorry, but I must be missing something. I copied the entire contents of the includes folder from the repository into my game's garrysmod/lua/includes/ . Files such as garrysmod/lua/includes/modules/socket.lua are present and have content. I've also downloaded all of the socket DLL files for Linux, my environment, into garrysmod/lua/bin/, with their original names. When I use require("socket") in my addon, though:

if SERVER then
    ...
    local socket = require("socket")
	...

I still get an error:

[troughcam_discord] Couldn't include file 'includes/modules/socket.core.lua' - File not found or is empty (@lua/includes/modules/socket.lua (line 12))
  1. unknown - lua/includes/modules/socket.lua:12
   2. require - [C]:-1
    3. unknown - addons/troughcam_discord/lua/autorun/troughcam_discord.lua:8


[troughcam_discord] lua/includes/modules/socket.lua:12: Module not found!
  1. require - [C]:-1
   2. unknown - lua/includes/modules/socket.lua:12
    3. require - [C]:-1
     4. unknown - addons/troughcam_discord/lua/autorun/troughcam_discord.lua:8


[troughcam_discord] addons/troughcam_discord/lua/autorun/troughcam_discord.lua:8: Module not found!
  1. require - [C]:-1
   2. unknown - addons/troughcam_discord/lua/autorun/troughcam_discord.lua:8

I've triple-checked my installation and the instructions, but the only thing I can think is that I must be missing something.