When installing QuickBooks, you may run into a problem when entering the License Number on the Product Key page. A QuickBooks Licenses Number is 15 digits. If you are only able to enter 11 digits like in the screenshot below, here is the fix for it:

Press the Num Lock key. Yes, it's that simple. I've seen this issue across multiple years and editions of QuickBooks. Sometimes, if you have Num Lock on, it will only allow you to enter 11 of the 15 characters. 

After turning off Num Lock:

If this helped you, please leave a comment below to let others know.