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Re: I installed Desktop Pro 2019 with Express settings, did it install QuickBooks Database Server Manager if I choose to set up Multi User at a later time?

Yes, even in single user non hosted install the database manager for that year will install. Even in single user mode QB uses database manager to communicate with your company file. You can see it as an installed process by looking at Task Manager. 

 

If you want to set up multiuser network down the road here are the instructions https://quickbooks.intuit.com/community/Inventory-and-projects/How-to-adjust-inventory-quantity-on-h...