Download the `[linode-auth-hook.sh](https://apps.andysh.uk/aheathershaw/letsencrypt-linode/src/branch/master/linode-auth-hook.sh)` and `[linode-cleanup-hook.sh](https://apps.andysh.uk/aheathershaw/letsencrypt-linode/src/branch/master/linode-cleanup-hook.sh)` shell scripts and make a note of where you have downloaded them to.