If you need any kind of assistance please join our Discord and submit a help ticket, it is the fastest way to get a response from a team member. https://discord.gg/6gH2sfZ
Type in the modpack name (FTAM | Server Pack) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select FTAM | Server Pack from the list on the left. The launcher will handle everything else!