It's common stuff in software world.. Nintendont changed some stuff, so loaders stopped working as they did before. Officially, Loader GX doesn't work either, just like Wiiflow; the one you downloaded is a modded version that fixes it to work with the changes made to nintendont. Give it a while and wiiflow will be updated as well.
Thanks for the prompt response. What's the difference between the wiiflow mod and the original?