To set up a new HDRP project using Unity Hub, click the New button, then select High Definition - Preview from the Template drop-down box. After clicking Create Project, Unity will automatically create a Project with the High Definition Render Pipeline package installed.
## Upgrading an Existing Project
To upgrade an existing Project, you must first download the High Definition Render Pipeline using the Package Manager UI.
After you have installed HDRP from the Package Manager UI you must add the HDRP Asset to the Scriptable Render Pipeline Graphics settings field.
GitHub