How do I redownload the game?

Haven't played it in years and got a new computer in that time.
I downloaded GOG Galaxy and in my "owned games" tab, it does not have a "install" tab only a "link executable tab" but I haven't downloaded it to the new computer.

If I could download it from another link apart from GOG then I could "link executable"

Could someone help me

Do you own Cyberpunk 2077 AND the extension Phantom Liberty?

In GOG Galaxy, when selecting the game, there should be an extra TAB called "Extras", usually you can download the offline installers & files from here.
If that doesn't work, open https://www.gog.com in your browser
* log in with your username & password
* click on your username in the topmost menu and choose "Games"
* on the page of the games you own, navigate to Cyberpunk 2077
* hover your mouse over the picture and click on the small downside triangle
* select "show downloads" (or something like this, I don't have the english language UI in my browser)
* this will show you all the files you can download for the game, split into 4 GB parts

In my case it will show:
for Cyberpunk - part 1 to 26
and for Phantom Liberty - part 1 to 10

In addition there are several patches & hotfixes which you can usually skip if you want a fresh version 2.0 installation.