1. Download forge-1.20.1-47.1.103-installer.jar to any temporary location.
  2. Create a new folder with a name that you like for the installation (I like "Minecraft-DW20-1.20-1.16").
  3. Run the standard Minecraft Launcher
  4. Download Minecraft-DW20-1.20-1.16.7z and extract the contents into the folder you created.
  5. Download ExtraStorage-1.20.1.4.0.7 and put into the mods folder (it was added after I packaged all of this)
  6. Run your new installation.
  7. Select multiplayer and add server
  8. Connect to the server and enjoy (hopefully)