Same way you did on the first computer.
Sign in to your Adobe account with your Adobe ID, download the Cloud desktop app then download your software.
Thanks John for your advice. I am a wildlife photographer and during the
last year have been changing my devices over to Apple for the most part. At
71, I have learned that you can teach a old dog new tricks, it just takes
my current laptop is about to go out on me. i have lightroom 6 installed and i want to put it on my new laptop. i have my cd. can i put it on a second computer without purchasing a new copy?
Yes you can, but you should sign out of Lightroom on the first PC before you do. There is a command under the Help menu in Lightroom 6 that will allow you to sign out or log out or some such words like that.