Hello there, DN29. We have a method for you to register your unsupported QuickBooks Desktop (QBDT) version, and I'll route you to the best available help for this.
QuickBooks 2017 is a discontinued version, and online registration is no longer available. You'll need a validation code to re-register the program. To get this, I'd recommend contacting our support team at https://intuit.me/CU to generate it for you. You can also contact them outside of the product to do this.
Once you're done, we'll have to make sure that your QBDT is registered successfully. Press F2 on your keyboard so the Product Information window will appear. An ACTIVATED or REGISTERED status should show next to the License number.
Please know that you can always get back into this thread if you have more questions or verification regarding product registration. I'll keep an eye out for your response.