Editing K3s - Kubernetes Simplified (section)

=== Get k3sup ===
Not surprisingly, there are multiple ways to do this.  The author wants you to download it from a marketplace app (arkade):
 curl -sLS https://dl.get-arkade.dev | sh
 # Install the binary using the command given as output, such as: 
 sudo cp arkade-darwin /usr/local/bin/arkade
 # Or on Linux:
 sudo cp arkade /usr/local/bin/arkade
 arkade get k3sup

... or you can just download it directly ...
 curl -sLS https://get.k3sup.dev | sh
 sudo install k3sup /usr/local/bin/

You just need to put it somewhere in your path (or use a full path reference).