Board Thread:Questions and Answers/@comment-67.42.38.21-20121205000849/@comment-121.74.149.138-20121205024312

If your having trouble rolling back to 3.1.2, try this:

Start Launcher Open options Click 'Clear Cache' button Select 'Manual build selection' This will enable the 'Select Modpack build' drop down menu Choose '3.1.2| 1.2.5| Rec. Build' Click 'OK' Login

It shouldn't ask to update at this time if you have cleared the cache but if it does click no.