This is not a mod, but a framework to install other mods without issues. It is not limited to a single game version. In many cases, it permits you to use mods with any version of the game. There are some exceptions, most notably the offline scoring mod.
Either way: anything you unlocked online should remain accessible while you are offline, even when you use mods. Modded items added through the mod framework are automatically unlocked by the offline content mod included with the framework.