gregtech-modpack-1.5.2 was updated to version 1.5.2.11 6 months ago
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 (gregtech-modpack-1.5.2) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select gregtech-modpack-1.5.2 from the list on the left. The launcher will handle everything else!