If you are having a problem launching the game, make sure that you have the latest version of java installed from https://java.com/en/download/manual.jsp
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 (Guns Missiles and More) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select Guns Missiles and More from the list on the left. The launcher will handle everything else!
If you are having a problem launching the game, make sure that you have the latest version of java installed from https://java.com/en/download/manual.jsp