You can use QuickBooks up to 30 days without registering.
After 30 days, you must register to continue using QuickBooks.
There is no charge to register QuickBooks. Registration entitles you
to many benefits including access to technical support and notification of
product upgrades, so we encourage you to register early.
For steps to register QuickBooks, go to Registering QuickBooks.
Where is my registration number?
QuickBooks no longer uses registration numbers. The license number you received when you purchased QuickBooks
takes the place of what was formerly known as a "registration" number.
You can find your license number on a sticker with your CD or by choosing About QuickBooks
from the Help menu.
What if I reinstalled QuickBooks on a new computer?
About QuickBooks licenses