Can't Download the Multiplayer Samples Utility Package

I was trying to install the Multiplayer Samples Utility Package (from https://docs-multiplayer.unity3d.com/netcode/current/components/networktransform/index.html) as a git URL but it gives me this error message:

[Package Manager Window] Error adding package: https://github.com/Unity-Technologi...kages/com.unity.multiplayer.samples.coop#main.
UnityEditor.EditorApplication:Internal_CallUpdateFunctions ()

Does anyone know what to do?

 

As said here: https://github.com/Unity-Technologi...r.samples.coop/tree/main/#getting-the-project
You need to download it as a zip.

 

Just one other question, how do I then import that zip into my unity project?

 

I guess add package from disk after you unzip it

 

I try but fail
it always tell me:
[Package Manager Window] Error adding package: com.unity.multiplayer.samples.coop@https://github.com/Unity-Technologies/com.unity.multiplayer.samples.coop.git?path=/Packages/com.unity.multiplayer.samples.coop#main.
Unable to add package [com.unity.multiplayer.samples.coop@https://github.com/Unity-Technologies/com.unity.multiplayer.samples.coop.git?path=/Packages/com.unity.multiplayer.samples.coop#main]:
Error when executing git command. fatal: unable to access 'https://github.com/Unity-Technologies/com.unity.multiplayer.samples.coop.git/': Failed to connect to github.com port 443 after 21089 ms: Timed out
UnityEditor.EditorApplication:Internal_CallUpdateFunctions ()