1. Download the Unity hub

Use this link- “https://unity3d.com/get-unity/downlad” to download the Unity hub.

1. Download unity version 2021.3.1

Open this link- “https://unity3d.com/get-unity/download/archive” and scroll down until you find version 2021.3.1 and click on the Unity Hub icon to download the version through the Unity hub.

Click on open Unity Hub on the dialog box that appears.

Select any platforms you want your project to have build support of and click on install.

1. Wait for the Unity version to download.

1. Login or signup to the Unity hub.

Sign-up if you have an existing account or create an account.

1. Activate your license.

After setting up, in the Unity Hub, go to → the settings icon

→ license management