Hi @ryanleeis and welcome to the Mattermost forums!
You do not really need to install mmctl, it’s just a binary that is bundled with every Mattermost server installation (default path is /opt/mattermost/bin/mmctl) but if you want to download the latest version or want to run it on a server where the Mattermost application server is not installed (or if your Mattermost setup is inside a container and you do not want to use docker exec to run mmctl, you can download it from the GitHub releases page and extract it to whatever location you like, f.ex. ’ /usr/local/bin/mmctl` using the below command:
wget https://github.com/mattermost/mmctl/releases/download/v7.10.2/linux_amd64.tar -O- | tar xf - > /usr/local/bin/mmctl