Скачать или смотреть how to download and install unity 3D and visual studio

this video very helpful to you for install the unity and visual studio software for game development The Unity Hub is a standalone application that streamlines the way you find, download, and manage your Unity Projects and installations. In addition, you can manually add versions of the Editor that you have already installed on your machine to your Hub.
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Open the Unity Hub, which was installed during the Visual Studio Tools for Unity installation.

On the left of the Unity Hub window, select the Installs tab.

Select the Add button.

In the Add Unity Version window, select a version of Unity to install.

Select Next to continue the installation.

In the Add modules to your install step, select Done.