Thanks for coming back to the Community and for sharing the complete details of your concern, EdwardSam.

I'll join this conversation to share some insights about QuickBooks Desktop Payroll.

As mentioned by my colleague, once QuickBooks Desktop Payroll subscription expires (on April 15, 2019, in your case), you'll no longer be able to use the payroll functions such as creating paychecks, paying taxes and filing forms. For QuickBooks Desktop 2016, you won't be able to access add-on services and will stop receiving updates on May 31, 2019.

As for the support link, I'll share this updated article that has the details about QuickBooks Desktop products and subscriptions: 

Manage your QuickBooks Desktop products and subscriptions in CAMPS.

Since you still need to use the payroll functionality, I'd suggesting reaching out to our Payroll Support Team. They can pull up your account and have the resources to help you change to a monthly payment schedule.

Here's how to contact us:

1. Open QuickBooks Desktop.
2. Click Help at the top and choose QuickBooks Desktop Help or press F1 on your keyboard.
3. On the Have a Question? screen, scroll down and select the QuickBooks support representative.
4. Choose QuickBooks Desktop, then select Payroll.
5. Select your payroll product.
6. Click the Chat with us link.

The screenshots below show these steps as well.

That information should get you back in order. I'd like to make sure that you're able to resolve this concern, so please let me know how it goes by posting a comment below. I wish you success in all your future endeavors.