PracticePanther doesn't support the desktop version of QuickBooks because Intuit has discontinued providing support for this version.
​Read the press release.

Currently we only integrate with the QuickBooks Online because they are taking their platform to the cloud. The good news is, Intuit is releasing many features for QuickBooks Online that will make your life and your bookkeeper's life a lot easier.
​Move to QuickBooks Online and see the difference!