By default, Unity downloads the Unity Hub from Jan 2019. You can go to the Unity website and select the download option. Select your Unity version and click download. Unity Hub installer will be downloaded to your computer. You can follow the basic procedures provided in the installer to install Unity Hub. You can then download and install any Unity version from the Hub.
Install Unity Without Hub
The major challenge here is to download the Unity installer. Unity has hidden the installer on the archive page. If you try to download Unity the traditional way from the homepage you will not get the option to download the Unity installer. You will get the Unity Hub instead. Follow the steps below to install Unity without hub.
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https://vionixstudio.com/2021/01/07/h...
Unity archive link
https://unity3d.com/get-unity/downloa...