Once your company file has been updated, it is not possible to open the QuickBooks company file in the older QB version.
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In case you have to update the company file from a different system, move the company file there, and once it is updated, move it to the original system.
With this blog, we will explain company file compatibility between QuickBooks Versions, which will help you avoid issues during QuickBooks company file upgrade. Upgrading the software ultimately asks for updating the company file as well and QuickBooks has the functionality to do it automatically when you open the older company file into the newer and updated versions of QuickBooks Desktop.
When upgrading to a newer version of QuickBooks, you are provided with enhanced features and bug fixes that might have affected the older versions.