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You have to take the proper steps to request a callback. This is a peer community. No one here can or will call you back.
Use the link to pick your QB Type, for steps on how to request help.
Did you purchase a new license or an additional seat for your current license? If you purchased a new license, they will give you the latest version (i.e 2021). You may purchase a new license of QBD 2020 until Nov 13 thru partners only.
If you have a company file created in QB2019 it can be directly opened and converted to QB2021
If you are moving to a new computer and already own QB2019 you did not have to purchase anything new - just download a fresh install of 2019 from your intuit account
You did not elaborate on why you needed 2019 specifically