It's my priority to help you sort this out,, @gwent1961.
I can see that you're using a Desktop Pro Plus, which means you're on an annual subscription, and you need to renew it annually. That's the reason why you were getting this message every time you open your QuickBooks. However, if you wish to purchase a one-time payment software, you can either buy it here in QuickBooks or a retail store.
You may want to check out this article for the differences between the QuickBooks Pro and QuickBooks Pro Plus: QuickBooks Desktop Pro vs. QuickBooks Desktop Pro Plus.
Let me know if you need more assistance with this. I'll be around to further help you. Have a great day!