Gflash updated to version 1.4.9
-Stellar API 0.1.3.3
-Stellar Sky 0.1.2.9b
(hopefully that will boost the performance back up)
-broken Booser Engine recipe
Type in the modpack name (Gflash) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select Gflash from the list on the left. The launcher will handle everything else!