DatPackRedux updated to version 5.7.4
Updated: Mekanism to #157 to fix a critical crash bug (ambient lighting)
Update: Waila Harvestability to 1.1.1
Type in the modpack name (DatPackRedux) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select DatPackRedux from the list on the left. The launcher will handle everything else!