If it stops responding during mod construction, close and relaunch until it works. Launcher will freeze when freezing assets at the end, just wait it out, it will launch.
Installing a modpack using the Technic Launcher is easy. If you don't already have the launcher downloaded, visit our download page to get the latest version.
Type in the modpack name (The Barnyard) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select The Barnyard from the list on the left. The launcher will handle everything else!