Fluxx 4 updated to version 1.0.1b
^ Applied Energistics to RV3 Beta 6
^ Mekanism to 126.96.36.1993
^ Project E to 1.10.0
Type in the modpack name (Fluxx 4) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select Fluxx 4 from the list on the left. The launcher will handle everything else!