Error message when trying to install HACS

I am a total newbie to Home Assistant but I can follow instructions, even if I don’t know what they are doing. I have Home Assistant running on a Home Assistant Yellow box and can access it from the Home Assistant app on my iPad and on my MacBook. Every time I run the “wget -O - | bash -” command sequence ion a terminal window, I get the error message “get: connection closed prematurely” as shown in the screenshot below:

Can anyone please point me in the right direction to solve this problem - it is slowly driving me crazy!

Did you manage to fix this? I’m having the same issue.

Tried completely uninstalling and reinstalling HAOS, still have the same error.
Always seems to fail between 60 and 80%