Download these libraries and place each in its own subfolder here:

  LibStub           https://www.curseforge.com/wow/addons/libstub
  CallbackHandler   https://www.curseforge.com/wow/addons/callbackhandler
  Ace3              https://www.curseforge.com/wow/addons/ace3
                    (provides AceAddon, AceEvent, AceComm, AceSerializer, AceGUI)
  LibDeflate        https://www.curseforge.com/wow/addons/libdeflate

Expected folder structure:
  libs/
    LibStub/
      LibStub.lua
    CallbackHandler-1.0/
      CallbackHandler-1.0.lua
    AceAddon-3.0/
      AceAddon-3.0.lua
    AceEvent-3.0/
      AceEvent-3.0.lua
    AceComm-3.0/
      AceComm-3.0.lua
    AceSerializer-3.0/
      AceSerializer-3.0.lua
    AceGUI-3.0/
      AceGUI-3.0.lua
      (+ widget files)
    LibDeflate/
      LibDeflate.lua
