Thank you modders for making this possible.
As requested credit is given per modder per their custom request in every mod listing within the Mods section of this platform page.
Type in the modpack name (The 1.12.2 Pack) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select The 1.12.2 Pack from the list on the left. The launcher will handle everything else!