It's Tekkit, simple enough, or at least the closest remake of the 1.6.4 modpack using 1.7.10.
Install A Classic Remastered
Step 1
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.
Step 2
Type in the modpack name (A Classic Remastered) or paste the following url into the search box.
Step 3
Finally, click Install at the bottom right of the launcher after you select A Classic Remastered from the list on the left. The launcher will handle everything else!