Using .png files as Zoom background:

Open the Zoom application and sign in to your account.
Click on the gear icon in the top right corner to open the Settings menu.
Click on the "Virtual Background" option on the left-hand side of the screen.
Click on the "+" button to add a new virtual background.
Click on "Add Image" and navigate to the folder where you extracted the .png files from the Zip file.
Select the .png file you want to use as your virtual background and click on "Open".
Your new virtual background will appear in the list of available virtual backgrounds.
Click on the virtual background you want to use to apply it to your Zoom meeting.