Any issues you are having please go to the support forums so people can help you!
http://voidlauncherforums.voidswrath.com/articles/
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 (CrazyCraft 3 Official Mods) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select CrazyCraft 3 Official Mods from the list on the left. The launcher will handle everything else!
Any issues you are having please go to the support forums so people can help you!
http://voidlauncherforums.voidswrath.com/articles/