The idea and design for this is great so well done to the dev for that, however the functionality for this is very poor. This actually does NOT work for a modpack 1-click installer as you would think. Yes, it downloads the pack from curseforge, but modpacks are very different than worlds or plugins. 90% of modpacks require you to run an "installer" on your computer to generate the modded files AND the correct forge.jar for the pack.
This installer only installs a .zip but doesn't run an installer or install the forge files. So, users will still have to manually download modpacks and upload their own files anyways. You will get more questions from users asking why it doesn't work so it's best not to use it anyways.
This review is purely based on the functionality of this addon as suggested as a "1-click modpack installer" which it is not.