Keep the system date and time accurate to prevent license errors.
Your product license allows for time changes to the system clock within two days of the current time. If you set your system clock back or forward more than two days, the next time you start your product, you will see a reminder to correct the system clock. If you do not correct the system clock, you receive a license error.
To prevent a license error, ensure that the system date and time on your computer are accurate when you install and activate your Autodesk product.