Install / Uninstall
Activating or deactivating this interface mod does not affect your savegames at all. It does not use SKSE. The load order should not matter either.

Installing
Use Wrye Bash, or Nexus Mod Manager. It's just one file so you can also unzip the archive and place the file in your Skyrim/Data/Interface folder.

Uninstalling
Simply delete the file, or rename it to “_dialoguemenu.swf” (for example) to disable it temporarily.