QuickBooks Desktop (single user) can be installed on up to two computers, given that the customer/purchaser is the only one who uses the program on both computers.
Important: Ensure that you read and comply with QuickBooks License Agreement before you install your version on your second computer.
Having QuickBooks on more than one computer is a huge help and convenience especially if you need to access QuickBooks from your office, at home, and even from your portable devices (laptop, tablet, etc).
If you wish to have QuickBooks on a third computer (or more), you may visit the official Intuit QuickBooks website or contact a support agent to provide you with options and support that would be most beneficial to you and your business.
For complete information on the QuickBooks License Agreement:
For instructions on how to install QuickBooks Desktop: