Installation

Checkout must be installed using Administrator privileges on your Mac
If more than one person is going to work in Checkout on the same machine, users must use a common, Checkout login ID on the Mac
This user can be a Mac Standard User
This user must install Checkout on the Mac, but the Mac Administrator password will be required
When a store is created, it will be created in this user's Library
Each employee can have a separate login to the Checkout Store (although they will share the Mac login ID)

Download the installation media
Double-click on the downloaded file, if the installation window didn't already open
In the resultant window, drag the Checkout application to the Applications folder in the window
Enter the Mac Administrator password
This will install Checkout in the Applications folder