If you need help you should ABSOLUTELY, NEVER visit our Forums or our Discord channel.
No one there can help you.
You cannot be helped.
Type in the modpack name (Not The 1.7.10 Pack) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select Not The 1.7.10 Pack from the list on the left. The launcher will handle everything else!