Hi there, wiffer18.
I'd agree with what @Fiat Lux - ASIA had replied. However, this is applicable to the updated versions of QuickBooks Desktop.
In your case, you can't add a user license because it is an older version. There is a service discontinuation of the product of QuickBooks Desktop every May 31st each year depending on what product version you are using.
You can click this link to learn more about the QuickBooks Desktop service discontinuation policy.
If you're interested to update your product, you can click this link: Choose the QuickBooks Desktop or Online product for your needs.
You can also click this link if you want to learn about QuickBooks Desktop price updates.
For further clarification with QuickBooks Desktop products, don't hesitate to reply to this post. Keep safe.
