Allow me to share some information about the conversion and guide you on what to do, sunnysd.

There are certain company file limitations when you'll want to upgrade or downgrade to another product, version, or edition. You can upgrade Pro company files to Enterprise Solutions (ES), but you're unable to open ES company files in Pro or Premier. You may want to check out a conversion tool or third-party application that will help you migrate your data to the QuickBooks Desktop version that you want to use. 

For more information about company file compatibility, go through this article for more information: Company Files Compatibility With QuickBooks Desktop When Upgrading. 

Additionally, you may also want to know more about QuickBooks Desktop, please see this article for your reference: QuickBooks Desktop Help Articles. 

Fill me in if you have any concerns about the process. I'll be right here to help you.