Unable to add registries through proxy on Julia 1.7.1, Julia 1.7.0

[HerAdri]

What have you tried so far to get Julia 1.7.1 to know your proxy settings?
Could you guide me to make this configuration?
I have done everything you can see in this thread:

I still can't use Julia 1.6.x

Julia 1.6 corporate firewall Any news to solve this problem?

I still can't use Julia 1.6.x

Julia 1.6 corporate firewall Any news to solve this problem?

Import the Pkgs already installed on another PC

Hello, In my workplace I do not have Internet, so I would like to import the Pkgs already installed on a PC with Internet. How to proceed? My interest is to study the Pkg “DiffEqTutorials”. So I need all the dependencies and I would like to do it with Ijulia. Gracias