Hi there, JBinSC.

Downgrading company file is unavailable with QuickBooks. Although we can open Desktop Pro to Enterprise edition, but not the other way around. 

Also, I agree with Fiat Lux - ASIA's suggestion to take advantage of the trial edition and search for a third party application in the market place.

Here's where you can check for a supported app that can successfully integrate with QuickBooks Desktop: Apps for QuickBooks Desktop.

Let me know if you need further assistance. I'm here to back you up. Have a good one.