LETS BURN THE DOWNLOADED .IMG.ZIP

1
Run Pi Imager and
Choose OS

2
Scroll to the bottom and select Use custom

3
Select the PI.Zip file you have saved to your computer from Github

4
Go ahead and select the sd card you are going to write the .img to

5
Accecpt that all data will be lost for the new .img

6
After the write and verify process completes you may select complete