Download, install and run the Curseforge installer from https://download.curseforge.com/
In the “Search for modpacks” search bar, enter “Vault Hunters” and press enter to search
When you see the entry for “Vault Hunters 3rd Edition”, click the install button to the right
Now wait for the install to finish. Once it has, you can launch Vault Hunters using the Play button that has replaced the Install button. Alternatively, use < Back to return to the main page showing just the installed modpacks.