QB Issue Resolution:

Payroll is a subscription add on to the QB program.  Assuming you have purchased it, you need to activate your license key.

https://community.intuit.com/articles/1763027-activate-quickbooks-desktop-payroll-basic-standard-or-…

Resolution for Issue 'How do I download payroll for desktop after I have installed the QB Accountant Desktop 2019?' available: Yes (Solved).
Source: Intuit Community forum.

How do I download payroll for desktop after I have installed the QB Accountant Desktop 2019?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Desktop 2019
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Error Recovery for Desktop 2019 [Canada]
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