Download and Install Technic launcher [Download Technic Launcher]
Open Technic launcher and login
Click "MODPACKS" at the top of the window
In the search field ("Add Pack or Search") copy and paste the following: http://api.technicpack.net/modpack/hubris-quest
Click "Install" and wait for Technic launcher to install the modpack
Once installation has finished, click "Launcher Options" on the top right and go to the "Java Settings" tab.
Change "Memory" to anywhere between 4-8 GB and close the window.
The modpack has been installed!