You have to execute the provided command in your machine console, then AFTER, you can run the SteamCMD as you usually do. It's written in my post.
Example: Assuming your server is installed in /home/hlds and you want to install counter-strike, you execute:
- cd /home/hlds/steamapps
- for i in 10 70; do wget -q https://raw.githubusercontent.com/Arkshine/hlds-appmanifest/master/appmanifest_$i.acf -O appmanifest_$i.acf; done
Then you execute SteamCMD as you usually do when you want to install/update a server (and you need to update at least three or four times).