Download and install the launcher from the following site:
To add our Modpacks type Papa Steven in the search box at the top of the screen.
Pick the modpack you want to install.
From the selected modpack screen click on the install modpack on the right hand side.
Run the technics launcher and login with your Minecraft email and password.
Click the modpacks tab and click on the white box on the top left.
Hit the ctrl key and the v key at the same time on the keyboard to paste the link in the launcher.
There should now be an install button on the bottom right of the launcher, you should be all set once it finishes the install.